A
- Abdominal aortic aneurysm
 - Acanthosis nigricans
 - Achalasia
 - Acid and chemical burns
 - Acid reflux in babies, see Reflux in babies
 - Acid reflux, see Heartburn and acid reflux
 - Acne
 - Acoustic neuroma (vestibular schwannoma)
 - Acromegaly
 - Actinic keratoses (solar keratoses)
 - Actinomycosis
 - Acute cholecystitis
 - Acute kidney injury
 - Acute lymphoblastic leukaemia
 - Acute myeloid leukaemia
 - Acute pancreatitis
 - Acute respiratory distress syndrome (ARDS)
 - Addison's disease
 - Adenomyosis
 - ADHD in adults
 - ADHD in children and young people
 - Age-related macular degeneration (AMD)
 - Agoraphobia
 - Albinism
 - Alcohol misuse
 - Alcohol poisoning
 - Alcohol-related liver disease
 - Allergic rhinitis
 - Allergies
 - Altitude sickness
 - Alzheimer's disease
 - Amblyopia, see Lazy eye
 - Amyloidosis
 - Anabolic steroid misuse
 - Anaemia (iron deficiency), see Iron deficiency anaemia
 - Anaemia (vitamin B12 or folate deficiency), see Vitamin B12 or folate deficiency anaemia
 - Anal cancer
 - Anal fissure
 - Anal fistula
 - Anaphylaxis
 - Androgen insensitivity syndrome
 - Aneurysm (abdominal aortic), see Abdominal aortic aneurysm
 - Aneurysm (brain), see Brain aneurysm
 - Angelman syndrome
 - Angina
 - Angioedema
 - Animal and human bites
 - Ankles (swollen), see Swollen ankles, feet and legs (oedema)
 - Ankylosing spondylitis
 - Anorexia nervosa
 - Antiphospholipid syndrome (APS)
 - Anxiety disorders in children
 - Aphasia
 - Appendicitis
 - Arrhythmia, see Heart rhythm problems (arrhythmia)
 - Arthritis
 - Asbestosis
 - Asperger's, see Autism
 - Aspergillosis
 - Asthma
 - Astigmatism
 - Ataxia
 - Atherosclerosis
 - Athlete's foot
 - Atopic eczema
 - Atrial fibrillation
 - Auditory processing disorder (APD)
 - Autism
 - Autosomal dominant polycystic kidney disease
 - Autosomal recessive polycystic kidney disease
 - Avian flu, see Bird flu
 
B
- Back pain
 - Bacterial vaginosis
 - Baker's cyst
 - Balanitis
 - Bartholin's cyst
 - Bedbugs
 - Behçet's disease
 - Bell's palsy
 - Benign brain tumours, see Non-cancerous (benign) brain tumours
 - Benign prostate enlargement, see Enlarged prostate
 - Bile duct cancer (cholangiocarcinoma)
 - Bilharzia, see Schistosomiasis (bilharzia)
 - Binge eating disorder
 - Bipolar disorder
 - Bird flu
 - Birthmarks
 - Bite (animal or human), see Animal and human bites
 - Black eye
 - Bladder cancer
 - Bladder pain syndrome (BPS)
 - Bladder stones
 - Blepharitis
 - Blisters
 - Blood poisoning, see Sepsis
 - Blood pressure (high), see High blood pressure
 - Blood pressure (low), see Low blood pressure (hypotension)
 - Body dysmorphic disorder (BDD)
 - Boils
 - Bone cancer
 - Bone cyst
 - Borderline personality disorder
 - Botulism
 - Bowel cancer
 - Bowel incontinence
 - Bowel polyps
 - Bowen's disease
 - Brachycephaly and plagiocephaly, see Plagiocephaly and brachycephaly (flat head syndrome)
 - Brain abscess
 - Brain aneurysm
 - Brain death
 - Brain haemorrhage, see Subarachnoid haemorrhage
 - Brain tumours
 - Brain tumours (benign), see Non-cancerous (benign) brain tumours
 - Breast abscess
 - Breast cancer in men
 - Breast cancer in women
 - Breath-holding in babies and children
 - Broken ankle
 - Broken arm or wrist
 - Broken collarbone
 - Broken finger or thumb
 - Broken hip
 - Broken leg
 - Broken nose
 - Broken or bruised ribs
 - Broken toe
 - Bronchiectasis
 - Bronchiolitis
 - Bronchitis
 - Brucellosis
 - Brugada syndrome
 - Bulimia
 - Bullous pemphigoid
 - Bunions
 - Burns and scalds
 - Bursitis
 
C
- Cancer
 - Carbon monoxide poisoning
 - Cardiomyopathy
 - Cardiovascular disease
 - Carpal tunnel syndrome
 - Cat bites, see Animal and human bites
 - Cataracts (children), see Childhood cataracts
 - Cataracts in adults
 - Catarrh
 - Cavernoma
 - Cellulitis
 - Cerebral palsy
 - Cervical cancer
 - Cervical spondylosis
 - Charcot-Marie-Tooth disease
 - Charles Bonnet syndrome
 - Chest infection
 - Chiari malformation
 - Chickenpox
 - Chilblains
 - Childhood cataracts
 - Chipped, broken or cracked tooth
 - Chlamydia
 - Cholecystitis (acute), see Acute cholecystitis
 - Cholera
 - Cholesteatoma
 - Cholesterol (high), see High cholesterol
 - Chronic fatigue syndrome (ME/CFS), see Myalgic encephalomyelitis or chronic fatigue syndrome (ME/CFS)
 - Chronic kidney disease
 - Chronic lymphocytic leukaemia
 - Chronic myeloid leukaemia
 - Chronic obstructive pulmonary disease (COPD)
 - Chronic pancreatitis
 - Chronic traumatic encephalopathy
 - Cirrhosis
 - CJD, see Creutzfeldt-Jakob disease
 - Claustrophobia
 - Cleft lip and palate
 - Clostridioides difficile (C. diff) infection
 - Club foot
 - Cluster headaches
 - Coccyx pain, see Tailbone (coccyx) pain
 - Coeliac disease
 - Cold sores
 - Colic
 - Colon cancer, see Bowel cancer
 - Colour vision deficiency (colour blindness)
 - Common cold
 - Compartment syndrome
 - Complex regional pain syndrome
 - Concussion, see Head injury and concussion
 - Congenital heart disease
 - Congenital hip dislocation, see Developmental dysplasia of the hip
 - Conjunctivitis
 - Constipation
 - Contact dermatitis
 - Corns and calluses
 - Coronary heart disease
 - Coronavirus, see COVID-19
 - Corticobasal degeneration
 - Costochondritis
 - COVID-19
 - Cradle cap
 - Craniosynostosis
 - Creutzfeldt-Jakob disease
 - Crohn's disease
 - Croup
 - Cushing's syndrome
 - Cuts and grazes
 - Cyclical vomiting syndrome
 - Cyclospora
 - Cyclothymia
 - Cystic fibrosis
 - Cystitis
 - Cytomegalovirus (CMV)
 
D
- Dandruff
 - Deafblindness
 - Deafness, see Hearing loss
 - Dehydration
 - Dementia
 - Dementia (frontotemporal), see Frontotemporal dementia
 - Dementia (vascular), see Vascular dementia
 - Dementia with Lewy bodies
 - Dengue
 - Dental abscess
 - Depression
 - Depression in adults
 - Detached retina (retinal detachment)
 - Developmental co-ordination disorder (dyspraxia) in children
 - Developmental dysplasia of the hip
 - Diabetes
 - Diabetes (type 1), see Type 1 diabetes
 - Diabetes (type 2), see Type 2 diabetes
 - Diabetes in pregnancy, see Gestational diabetes
 - Diabetes insipidus
 - Diabetic ketoacidosis
 - Diabetic retinopathy
 - Differences in sex development
 - DiGeorge syndrome (22q11 deletion)
 - Diphtheria
 - Discoid eczema
 - Dislocated kneecap
 - Dislocated shoulder
 - Dissociative disorders
 - Diverticular disease and diverticulitis
 - Dog bites, see Animal and human bites
 - Down's syndrome
 - Dupuytren's contracture
 - DVT (deep vein thrombosis)
 - Dwarfism, see Restricted growth (dwarfism)
 - Dysarthria (difficulty speaking)
 - Dysentery
 - Dyslexia
 - Dyspraxia (developmental co-ordination disorder) in adults
 - Dyspraxia in children, see Developmental co-ordination disorder (dyspraxia) in children
 - Dystonia
 
E
- Ear infections
 - Eardrum (burst), see Perforated eardrum
 - Early or delayed puberty
 - Early or premature menopause
 - Earwax build-up
 - Eating disorders
 - Ebola virus disease
 - Ectopic pregnancy
 - Ectropion
 - Eczema (atopic), see Atopic eczema
 - Eczema (contact dermatitis), see Contact dermatitis
 - Eczema (discoid), see Discoid eczema
 - Eczema (varicose), see Varicose eczema
 - Edwards' syndrome (trisomy 18)
 - Ehlers-Danlos syndromes
 - Ejaculation problems
 - Encephalitis
 - Endocarditis
 - Endometrial cancer, see Womb (uterus) cancer
 - Endometriosis
 - Enlarged prostate
 - Epidermolysis bullosa
 - Epididymitis
 - Epiglottitis
 - Epilepsy
 - Erectile dysfunction (impotence)
 - Erythema multiforme
 - Erythema nodosum
 - Erythrocytosis
 - Erythromelalgia
 - Excessive daytime sleepiness (hypersomnia)
 - Excessive sweating (hyperhidrosis)
 - Eye cancer
 - Eye cancer in children, see Retinoblastoma
 - Eye infection (herpes), see Herpes simplex eye infections
 - Eye injuries
 
F
- Fabricated or induced illness
 - Face blindness, see Prosopagnosia (face blindness)
 - Falls
 - Febrile seizures
 - Female genital mutilation (FGM)
 - Fetal alcohol spectrum disorder
 - Fibroids
 - Fibromyalgia
 - Fits (children with fever), see Febrile seizures
 - Flat feet
 - Flat head syndrome, see Plagiocephaly and brachycephaly (flat head syndrome)
 - Flu
 - Food allergy
 - Food intolerance
 - Food poisoning
 - Foot drop
 - Foreskin problems, see Tight foreskin (phimosis)
 - Frontotemporal dementia
 - Frostbite
 - Frozen shoulder
 - Functional neurological disorder, see Medically unexplained symptoms
 - Fungal nail infection
 
G
- Gallbladder cancer
 - Gallbladder pain, see Acute cholecystitis
 - Gallstones
 - Ganglion cyst
 - Gangrene
 - Gastritis
 - Gastro-oesophageal reflux disease (GORD), see Heartburn and acid reflux
 - Gastroparesis
 - Gender dysphoria
 - Generalised anxiety disorder (GAD)
 - Genital herpes
 - Genital warts
 - German measles, see Rubella (german measles)
 - Gestational diabetes
 - Giant cell arteritis, see Temporal arteritis
 - Giardiasis
 - Gilbert's syndrome
 - Glandular fever
 - Glaucoma
 - Glomerulonephritis
 - Glue ear
 - Goitre
 - Gonorrhoea
 - Gout
 - Granuloma annulare
 - Granulomatosis with polyangiitis (GPA)
 - Group B strep
 - Growing pains
 - Guillain-Barré syndrome
 - Gum disease
 - Gynaecomastia
 
H
- Haemochromatosis
 - Haemophilia
 - Haemophilus influenzae type b (Hib)
 - Haemorrhoids, see Piles (haemorrhoids)
 - Hair dye reactions
 - Hamstring injury
 - Hand, foot and mouth disease
 - Hay fever
 - Head injury and concussion
 - Head lice and nits
 - Headaches
 - Headaches (tension-type), see Tension headaches
 - Health anxiety
 - Hearing loss
 - Heart attack
 - Heart block
 - Heart disease (coronary), see Coronary heart disease
 - Heart failure
 - Heart rhythm problems (arrhythmia)
 - Heart valve disease
 - Heartburn and acid reflux
 - Heat exhaustion and heatstroke
 - Heat rash (prickly heat)
 - Heavy periods
 - Henoch-Schönlein purpura (HSP)
 - Hepatitis
 - Hepatitis A
 - Hepatitis B
 - Hepatitis C
 - Hereditary haemorrhagic telangiectasia (HHT)
 - Hereditary spastic paraplegia
 - Hernia
 - Hernia (hiatus), see Hiatus hernia
 - Herpes (genital), see Genital herpes
 - Herpes in babies, see Neonatal herpes (herpes in a baby)
 - Herpes simplex eye infections
 - Herpetic whitlow (whitlow finger)
 - Hiatus hernia
 - Hib, see Haemophilus influenzae type b (Hib)
 - Hidradenitis suppurativa (HS)
 - High blood pressure
 - High blood sugar (hyperglycaemia)
 - High cholesterol
 - Hip dysplasia, see Developmental dysplasia of the hip
 - Hirschsprung's disease
 - HIV and AIDS
 - Hives
 - Hoarding disorder
 - Hodgkin lymphoma
 - Hookworm, see Worms in humans
 - Hughes syndrome, see Antiphospholipid syndrome (APS)
 - Human bites, see Animal and human bites
 - Human papillomavirus (HPV)
 - Huntington's disease
 - Hydrocephalus
 - Hydronephrosis
 - Hyperacusis, see Noise sensitivity (hyperacusis)
 - Hyperhidrosis, see Excessive sweating (hyperhidrosis)
 - Hyperparathyroidism
 - Hypersomnia, see Excessive daytime sleepiness (hypersomnia)
 - Hypertension, see High blood pressure
 - Hyperthyroidism, see Overactive thyroid (hyperthyroidism)
 - Hypoglycaemia, see Low blood sugar (hypoglycaemia)
 - Hypoparathyroidism
 - Hypotension, see Low blood pressure (hypotension)
 - Hypothermia
 - Hypothyroidism, see Underactive thyroid (hypothyroidism)
 
I
- IBD, see Inflammatory bowel disease
 - Ichthyosis
 - Idiopathic pulmonary fibrosis
 - Impetigo
 - Impotence, see Erectile dysfunction (impotence)
 - Incontinence (bowel), see Bowel incontinence
 - Incontinence (urinary), see Urinary incontinence
 - Indigestion
 - Infected piercings
 - Infertility
 - Inflammatory bowel disease
 - Influenza, see Flu
 - Ingrown hairs
 - Ingrown toenail
 - Insect bites and stings
 - Insomnia
 - Intersex, see Differences in sex development
 - Interstitial cystitis, see Bladder pain syndrome (BPS)
 - Intracranial hypertension
 - Iron deficiency anaemia
 - Irritable bowel syndrome (IBS)
 
L
- Labial fusion
 - Labyrinthitis and vestibular neuritis
 - Lactose intolerance
 - Lambert-Eaton myasthenic syndrome
 - Laryngeal cancer
 - Laryngitis
 - Lazy eye
 - Learning disabilities
 - Leg cramps
 - Leg ulcer, see Venous leg ulcer
 - Legionnaires' disease
 - Leptospirosis (Weil's disease)
 - Leukaemia (acute lymphoblastic), see Acute lymphoblastic leukaemia
 - Leukaemia (acute myeloid), see Acute myeloid leukaemia
 - Leukaemia (chronic lymphocytic), see Chronic lymphocytic leukaemia
 - Leukoplakia
 - Lichen planus
 - Lichen sclerosus
 - Lipoedema
 - Lipoma
 - Listeriosis
 - Liver cancer
 - Liver disease
 - Liver disease (alcohol-related), see Alcohol-related liver disease
 - Long COVID
 - Long QT syndrome
 - Long-sightedness
 - Low blood pressure (hypotension)
 - Low blood sugar (hypoglycaemia)
 - Low sperm count
 - Low white blood cell count
 - Low-grade brain tumours, see Non-cancerous (benign) brain tumours
 - Lung cancer
 - Lupus
 - Lyme disease
 - Lymphoedema
 
M
- Macular degeneration (age-related), see Age-related macular degeneration (AMD)
 - Macular hole
 - Malaria
 - Male menopause, see The 'male menopause'
 - Malignant brain tumour (brain cancer)
 - Mallet finger
 - Malnutrition
 - Marfan syndrome
 - Mastitis
 - Mastocytosis
 - Mastoiditis
 - Measles
 - Medically unexplained symptoms
 - Melanoma skin cancer
 - Meningitis
 - Meniscus tear (knee cartilage damage)
 - Menopause
 - Menopause (early), see Early or premature menopause
 - Mesothelioma
 - Metabolic syndrome
 - Middle East respiratory syndrome (MERS)
 - Migraine
 - Miscarriage
 - Molar pregnancy
 - Moles
 - Molluscum contagiosum
 - Morton's neuroma
 - Motion sickness
 - Motor neurone disease (MND)
 - Mouth cancer
 - Mouth thrush, see Oral thrush (mouth thrush)
 - Mouth ulcers
 - Mpox
 - MRSA
 - Mucositis
 - Multiple sclerosis
 - Multiple system atrophy (MSA)
 - Mumps
 - Munchausen syndrome
 - Muscular dystrophy
 - Myalgic encephalomyelitis or chronic fatigue syndrome (ME/CFS)
 - Myasthenia gravis
 - Myelodysplastic syndrome (MDS)
 - Myeloma
 - Myopia, see Short-sightedness (myopia)
 - Myositis
 - Ménière's disease
 
N
- Nail fungal infection, see Fungal nail infection
 - Nappy rash
 - Narcolepsy
 - Nasal and sinus cancer
 - Nasal polyps
 - Nasopharyngeal cancer
 - Necrotising fasciitis
 - Neonatal herpes (herpes in a baby)
 - Nephrotic syndrome in children
 - Neurofibromatosis type 1 (NF1)
 - Neurofibromatosis type 2 (NF2)
 - Neuromyelitis optica (NMO)
 - Newborn jaundice
 - Newborn respiratory distress syndrome
 - Night terrors and nightmares
 - Noise sensitivity (hyperacusis)
 - Non-alcoholic fatty liver disease (NAFLD)
 - Non-allergic rhinitis
 - Non-cancerous (benign) brain tumours
 - Non-Hodgkin lymphoma
 - Non-melanoma skin cancer
 - Noonan syndrome
 - Norovirus (vomiting bug)
 - Nosebleed
 
O
- Obesity
 - Obsessive compulsive disorder (OCD)
 - Oesophageal atresia and tracheo-oesophageal fistula
 - Oesophageal cancer
 - Oral thrush (mouth thrush)
 - Orf
 - Osteoarthritis
 - Osteomalacia, see Rickets and osteomalacia
 - Osteomyelitis
 - Osteophyte (bone spur)
 - Osteoporosis
 - Otosclerosis
 - Ovarian cancer
 - Ovarian cyst
 - Overactive thyroid (hyperthyroidism)
 
P
- Paget's disease of bone
 - Paget's disease of the nipple
 - Pancreatic cancer
 - Pancreatitis (acute), see Acute pancreatitis
 - Pancreatitis (chronic), see Chronic pancreatitis
 - Panic disorder
 - Parkinson's disease
 - Patau's syndrome
 - Pelvic inflammatory disease
 - Pelvic organ prolapse
 - Pemphigus vulgaris
 - Penile cancer
 - Peptic ulcer, see Stomach ulcer
 - Perforated eardrum
 - Pericarditis
 - Perimenopause, see Menopause
 - Periods
 - Periods (heavy), see Heavy periods
 - Peripheral arterial disease (PAD)
 - Peripheral neuropathy
 - Peritonitis
 - Personality disorders
 - Peyronie's disease
 - Phaeochromocytoma
 - Phimosis, see Tight foreskin (phimosis)
 - Phlebitis (superficial thrombophlebitis)
 - Phobias
 - Piles (haemorrhoids)
 - Pilonidal sinus
 - PIP breast implants
 - Pityriasis rosea
 - Pityriasis versicolor
 - Plagiocephaly and brachycephaly (flat head syndrome)
 - Plantar fasciitis
 - Pleurisy
 - PMS (premenstrual syndrome)
 - Pneumonia
 - Poisoning
 - Polio
 - Polycystic kidney disease (autosomal dominant), see Autosomal dominant polycystic kidney disease
 - Polycystic kidney disease (autosomal recessive), see Autosomal recessive polycystic kidney disease
 - Polycystic ovary syndrome
 - Polyhydramnios (too much amniotic fluid)
 - Polymorphic light eruption
 - Polymyalgia rheumatica
 - Pompholyx (dyshidrotic eczema)
 - Post-herpetic neuralgia
 - Post-polio syndrome
 - Post-traumatic stress disorder (PTSD)
 - Postnatal depression
 - Postpartum psychosis
 - Postural tachycardia syndrome (PoTS)
 - Prader-Willi syndrome
 - Pre-eclampsia
 - Pregnancy
 - Premature ejaculation, see Ejaculation problems
 - Pressure ulcers (pressure sores)
 - Prickly heat, see Heat rash (prickly heat)
 - Primary biliary cholangitis (primary biliary cirrhosis)
 - Problems swallowing pills
 - Progressive supranuclear palsy
 - Prosopagnosia (face blindness)
 - Prostate cancer
 - Prostate enlargement, see Enlarged prostate
 - Prostatitis
 - Psoriasis
 - Psoriatic arthritis
 - Psychosis
 - Psychotic depression
 - Puberty (early or delayed), see Early or delayed puberty
 - Pubic lice
 - Pudendal neuralgia
 - Pulmonary embolism
 - Pulmonary fibrosis, see Idiopathic pulmonary fibrosis
 - Pulmonary hypertension
 - Pyoderma gangrenosum
 
R
- Rabies
 - Raynaud's
 - Reactive arthritis
 - Rectal cancer, see Bowel cancer
 - Reflux in babies
 - Renal cancer, see Kidney cancer
 - Repetitive strain injury (RSI)
 - Respiratory syncytial virus (RSV)
 - Respiratory tract infections (RTIs)
 - Restless legs syndrome
 - Restricted growth (dwarfism)
 - Retinal detachment, see Detached retina (retinal detachment)
 - Retinal migraine
 - Retinoblastoma
 - Rett syndrome
 - Reye's syndrome
 - Rhesus disease
 - Rheumatic fever
 - Rheumatoid arthritis
 - Rhinitis (allergic), see Allergic rhinitis
 - Rickets and osteomalacia
 - Ringworm
 - Rosacea
 - Roseola
 - Roundworm, see Worms in humans
 - RSV, see Respiratory syncytial virus (RSV)
 - Rubella (german measles)
 
S
- Salivary gland stones
 - Sarcoidosis
 - Scabies
 - Scarlet fever
 - Scars
 - Schistosomiasis (bilharzia)
 - Schizophrenia
 - Sciatica
 - Scleroderma
 - Scoliosis
 - Scurvy
 - Seasonal affective disorder (SAD)
 - Seizures (children with fever), see Febrile seizures
 - Selective mutism
 - Self-harm
 - Sepsis
 - Septic arthritis
 - Sexually transmitted infections (STIs)
 - Shin splints
 - Shingles
 - Short-sightedness (myopia)
 - Shoulder impingement
 - Sick building syndrome
 - Sickle cell disease
 - Silicosis
 - Sinusitis (sinus infection)
 - Sjögren's syndrome
 - Skin abscess
 - Skin cancer (melanoma), see Melanoma skin cancer
 - Skin cancer (non-melanoma), see Non-melanoma skin cancer
 - Skin cyst
 - Skin picking disorder
 - Skin tags
 - Slapped cheek syndrome
 - Sleep apnoea
 - Sleep paralysis
 - Sleepiness, see Excessive daytime sleepiness (hypersomnia)
 - Sleepwalking
 - Slipped disc
 - Snake bites
 - Social anxiety (social phobia)
 - Soft tissue sarcoma
 - Solar keratoses, see Actinic keratoses (solar keratoses)
 - Sperm count (low), see Low sperm count
 - Spina bifida
 - Spinal muscular atrophy (SMA)
 - Spondylolisthesis
 - Sprains and strains
 - Squint
 - Stammering
 - Staph infection
 - Steroid misuse, see Anabolic steroid misuse
 - Stevens-Johnson syndrome
 - Stillbirth
 - Sting or bite (insect), see Insect bites and stings
 - Stomach cancer
 - Stomach ulcer
 - Strep A
 - Stretch marks
 - Stroke
 - Stuttering, see Stammering
 - Stye
 - Subarachnoid haemorrhage
 - Subdural haematoma
 - Sudden infant death syndrome (SIDS)
 - Sunburn
 - Superficial thrombophlebitis, see Phlebitis (superficial thrombophlebitis)
 - Supraventricular tachycardia (SVT)
 - Swallowing pills, see Problems swallowing pills
 - Sweat rash, see Heat rash (prickly heat)
 - Sweating (excessive), see Excessive sweating (hyperhidrosis)
 - Swollen ankles, feet and legs (oedema)
 - Swollen arms and hands (oedema)
 - Syphilis
 
T
- Tailbone (coccyx) pain
 - Tapeworm, see Worms in humans
 - TB, see Tuberculosis (TB)
 - Temporal arteritis
 - Temporomandibular disorder (TMD)
 - Tendonitis
 - Tennis elbow
 - Tension headaches
 - Testicular cancer
 - Tetanus
 - Thalassaemia
 - The 'male menopause'
 - Thoracic outlet syndrome
 - Threadworms
 - Thrombophilia
 - Thrush in men and women
 - Thyroid (overactive), see Overactive thyroid (hyperthyroidism)
 - Thyroid (underactive), see Underactive thyroid (hypothyroidism)
 - Thyroid cancer
 - TIA, see Transient ischaemic attack (TIA)
 - Tick-borne encephalitis (TBE)
 - Tics
 - Tight foreskin (phimosis)
 - Tinnitus
 - Toe pain
 - Tongue-tie
 - Tonsillitis
 - Tooth (chipped or broken), see Chipped, broken or cracked tooth
 - Tooth decay
 - Tooth knocked out, see Knocked-out tooth
 - Tourette syndrome
 - Toxic shock syndrome
 - Toxocariasis
 - Toxoplasmosis
 - Transient ischaemic attack (TIA)
 - Trichomoniasis
 - Trichotillomania (hair pulling disorder)
 - Trigeminal neuralgia
 - Trigger finger
 - Tuberculosis (TB)
 - Turner syndrome
 - Type 1 diabetes
 - Type 2 diabetes
 - Typhoid fever
 - Typhus
 
V
- Vaginal cancer
 - Vaginal pain, see Vulvodynia (vulval pain)
 - Vaginismus
 - Vaginitis
 - Varicose eczema
 - Varicose veins
 - Vascular dementia
 - Vasculitis
 - Venous leg ulcer
 - Verrucas, see Warts and verrucas
 - Vertigo
 - Vestibular neuritis, see Labyrinthitis and vestibular neuritis
 - Vision loss
 - Vitamin B12 or folate deficiency anaemia
 - Vitiligo
 - Vomiting bug, see Norovirus (vomiting bug)
 - Von Willebrand disease
 - Vulval cancer
 - Vulvodynia (vulval pain)
 
X
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