Pain in the left hypochondrium most often develops with pathologies of the abdominal organs: acute and chronic pancreatitis, Payr's syndrome, splenomegaly and traumatic injuries of the spleen. Occasionally, a symptom occurs with lung damage (pneumonia and pleurisy), an atypical form of myocardial infarction, intercostal neuralgia. To diagnose the causes of pain, an instrumental examination is carried out using ultrasound, radiological and radioisotope methods. Treatment includes analgesics, etiopathogenetic agents (enzymes, antibiotics, drugs with antisecretory effect), surgical interventions.