1, which means:
"Physical illness" usually refers to physical illness or other health problems, and the degree is heavier. It originated from the ancient word "feeling sick" in China, which means getting sick and has a certain historical and cultural background. "Poor health" is a colloquial expression, which usually refers to poor health, but not necessarily to illness or serious discomfort. In this word, "owe" means lack, and "disease" originally refers to disease, but it can be understood as a state of lack of health here.
2. Usage: "Being sick" is usually used in more formal or official occasions, which is a more polite and formal expression. For example, in a letter or on a formal occasion, you can say, "I am very ill and can't attend today's meeting." "Sick body" is usually used in oral or informal context, and it is a more casual and relaxed expression. For example, in daily communication or informal occasions, you can say, "I am sick today and don't want to go out to play."