How to diagnose a disease by symptoms

Diseases of various organs have specific symptoms.

Nervous system: headache, nausea, vomiting, visual disturbances, motor defects (paralysis), incoordination, sensory loss and disturbances (paraesthesiae), altered levels of consciousness

Respiratory system
: cough, expectoration, breathlessness, wheezing, chest pain, diminished exercise tolerance

Cardiovascular system: loss of consciousness (syncope), breathlessness, diminished exercise tolerance, retrosternal chest pain, intermittent pain in limbs on walking (intermittent claudication), rest pain in the limbs, gangrene (necrosis of tissue)

Hepatobiliary-pancreatic system: nausea and vomiting, pain, jaundice, itching, bleeding tendency, weight gain due to water retention, weight loss

Gastrointestinal system: loss of appetite (anorexia), nausea and vomiting, difficulty in swallowing, indigestion, abdominal pain, altered bowel habit (diarrhoea and/or constipation), blood in vomit (haematemesis), passage of slime and fresh or altered blood in the faeces

Genitourinary system: loin pain, fever, suprapubic pain, frequency, painful micturition (dysuria), micturition at night (nocturia), poor stream, dribbling and incontinence, blood in urine (haematuria), enlarged or tender testis

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