What are the common diseases in internal medicine?

Common diseases in internal medicine involve multiple systems and mainly include: 1. Respiratory system diseases: such as bronchitis, pneumonia, asthma, etc., which affect respiratory function and often present with coughing, shortness of breath. 2. Digestive system diseases: such as gastritis, gastric ulcer, hepatitis, etc., which affect digestion and nutrient absorption, often accompanied by symptoms such as stomach pain and nausea. 3. Cardiovascular system diseases: such as hypertension, coronary heart disease, angina pectoris, etc., which affect heart and vascular health, commonly presenting with palpitations and chest pain. 4. Nervous system diseases: such as cerebral infarction, cerebral hemorrhage, etc., which affect brain function and may cause headaches, limb paralysis. 5. Endocrine system diseases: such as diabetes, thyroid diseases, etc., which affect hormone levels, with common symptoms including excessive thirst, increased appetite, and weight loss.