This is a list of common, well-known or infamous diseases. This is neither complete nor authoritative. This is not intended to be a list of rare diseases, nor is it a list of mental disorders.

This list includes both common names and technical names for diseases. This is deliberate; where multiple names are in common use for the same disease, all of those names should link to the main article for the disease

A
 Abscess
Acute Radiation Sickness
 Alzheimer's disease
 Anthrax
 Appendicitis
Allergy
 Arthritis
 Aseptic meningitis
 Asthma
 Astigmatism
 Atherosclerosis

B 
 Bacterial meningitis
 Beriberi
 Black Death
 Black Fungus
 Botulism
 Breast cancer
 Bronchitis
 Brucellosis
 Bubonic plague
 Bunion
 Boil

C 

 Campylobacter infection
 Cancer
 Candidiasis
Carbon monoxide poisoning
Coeliac disease
 Cerebral palsy
 Chagas disease
 Chickenpox
 Chlamydia
 Chlamydia trachomatis
 Cholera
 Chordoma
 Chorea
Chronic fatigue syndrome
 Circadian rhythm sleep disorder
 Colitis
 Common cold
Condyloma
 Congestive heart disease
 Coronary heart disease
COVID-19
 Cowpox
 Crohn's Disease
 Coronavirus

D 
Dengue Fever
 Diabetes mellitus
 Diphtheria
 Dehydration
Dysentery

E 
 Ear infection
 Ebola
 Encephalitis
 Emphysema
 Epilepsy
 Erectile dysfunction

F 
 Fibromyalgia
 Foodborne illness

G 
Gangrene
Gastroenteritis
Genital herpes
GERD
Goitre
Gonorrhea

H 
 Heart disease
 Hepatitis A
 Hepatitis B
 Hepatitis C
 Hepatitis D
 Hepatitis E
 Histiocytosis (childhood cancer)
 HIV
 Human papillomavirus
 Huntington's disease
 Hypermetropia
 Hyperopia
 Hyperthyroidism
 Hypothyroid
 Hypotonia

I 
 Impetigo
 Infertility
 Influenza
 Interstitial cystitis

 Iritis
 Iron-deficiency anemia
 Irritable bowel syndrome
 Ignious Syndrome
 Intestine ache
 Intestine Gas
 Intestine disease
 Upset Intestine

J 
 Jaundice

K 
 Keloids
 Kuru
 Kwashiorkor
 Kidney stone disease

L 
 Laryngitis
 Lead poisoning
 Legionellosis
 Leishmaniasis
 Leprosy
 Leptospirosis
 Listeriosis
 Leukemia
 Lice
 Loiasis
 Lung cancer
 Lupus erythematosus
 Lyme disease
 Lymphogranuloma venereum
 Lymphoma
 Limbtoosa

M 
 Mad cow disease 
 Malaria
 Marburg fever
 Measles
 Melanoma
 Metastatic cancer
 Meniere's disease
 Meningitis
 Migraine
 Mononucleosis
 Multiple myeloma
 Multiple sclerosis
 Mumps
 Muscular dystrophy
 Myasthenia gravis
 Myelitis
 Myoclonus
 Myopia
 Myxedema
 Morquio Syndrome
 Mattticular syndrome
 Mononucleosis

N 
 Neoplasm
 Non-gonococcal urethritis
 Necrotizing Fasciitis
 Night blindness

O 
 Obesity
 Osteoarthritis
 Osteoporosis
 Otitis

P 
 Palindromic rheumatism
 Paratyphoid fever
 Parkinson's disease
 Pelvic inflammatory disease
 Peritonitis
 Periodontal disease
 Pertussis
 Phenylketonuria
 Plague
 Poliomyelitis
 Porphyria
 Progeria
 Prostatitis
 Psittacosis
 Psoriasis
 Pubic lice
 Pulmonary embolism
 Pilia
 pneumonia

Q 
 Q fever
 Ques fever

R 
 Rabies
 Repetitive strain injury
 Rheumatic fever
 Rheumatic heart
 Rheumatism
 Rheumatoid arthritis
 Rickets
 Rift Valley fever
 Rocky Mountain spotted fever
 Rubella

S 
 Salmonellosis
 Scabies
 Scarlet fever
 Sciatica
 Scleroderma
 Scrapie
 Scurvy
 Sepsis
 Septicemia
 SARS
 Shigellosis
 Shin splints
 Shingles
 Sickle-cell anemia
 Siderosis
 SIDS
 Silicosis
 Smallpox
 Stevens–Johnson syndrome
 Stomach flu
 Stomach ulcers
 Strabismus
 Strep throat
 Streptococcal infection
 Synovitis
 Syphilis
 Swine influenza
 Stomach Gas
  Stomach Ache
 stomach Disease
 Kids Stomach Ache
 Upset Stomach

T 
 Taeniasis
 Tay-Sachs disease
 Tennis elbow
 Teratoma
 Tetanus
 Thalassaemia
 Thrush
 Thymoma
 Tinnitus
 Tonsillitis
 Tooth decay
 Toxic shock syndrome
 Trichinosis
 Trichomoniasis
 Trisomy
 Tuberculosis
 Tularemia
 Tungiasis
 Typhoid fever
 Typhus
 Tumor

U 
 Ulcerative colitis
 Ulcers
 Uremia
 Urticaria
 Uveitis
UTI'S

V 
 Varicella
 Varicose veins
 Vasovagal syncope
 Vitiligo
 Von Hippel-Lindau disease
 Viral fever
 Viral meningitis

W 
 Warkany syndrome
 Warts
 Watkins

Y 
 Yellow fever
 Yersiniosis

Disease-related lists