Pain on the left side of the body: what could it mean?…..See more

Heart attack (myocardial infarction) – sudden, severe chest pain, sometimes radiating to the left arm, shoulder, neck, jaw, or back
Pericarditis – inflammation of the heart’s lining
Symptoms of heart-related pain:
Pressure, tightness, or squeezing in the chest
Shortness of breath
Nausea or vomiting
Cold sweats
Pain radiating to left arm, neck, jaw, or back 

Anatomy
Important: Sudden, severe left-sided chest pain should always be treated as an emergency. Call emergency services immediately.
C. Lung and Respiratory Causes
The left side of the chest and upper back may experience pain due to lung conditions:
Pleurisy – inflammation of the lining of the lungs, causing sharp pain during breathing
Pneumothorax (collapsed lung) – sudden pain and shortness of breath
Pulmonary embolism – a blood clot in the lungs, often causing sharp chest pain and difficulty breathing
Symptoms: pain worsens with breathing or coughing, shortness of breath, rapid heartbeat, or coughing blood.
D. Digestive System Causes
Pain on the left side of the abdomen is often linked to the digestive tract: 

Pain Management
Gastritis or stomach ulcers – burning pain in the upper left abdomen
Diverticulitis – inflammation of pouches in the colon, usually causing lower-left abdominal pain
Constipation or gas – mild to moderate discomfort
Pancreatitis – inflammation of the pancreas, can cause upper-left abdominal pain radiating to the back
Symptoms: bloating, nausea, vomiting, diarrhea or constipation, fever (in case of infection).
E. Kidney and Urinary Causes
The left kidney is located slightly lower than the ribs on the left side. Kidney-related pain may be caused by:
Kidney stones – sharp pain radiating from the back to the abdomen and groin 

Heart & Hypertension