Rainy day aches and pains can be caused by autonomic nerve disorders or autoimmune diseases. 1. Autonomic nerve disorders: long-term work in a high-pressure environment, late at night, anxiety, biological clock inversion and other factors, resulting in the body for a long time can not get normal rest and adjustment, may cause autonomic nerve disorders, coupled with the rainy days, the temperature is relatively low, the whole body metabolism is slowed down, resulting in metabolites accumulate in the body, the body aches and pains may occur symptoms. 2. Autoimmune diseases: patients with autoimmune diseases may experience accumulation in multiple joints and parts of the body, resulting in joint osteophytes and increased joint fluid. Rainy days, the temperature is lowered, the whole body immune system function is weakened, may also appear body aches and pains, common diseases such as rheumatoid arthritis, gouty arthritis and so on. Rainy day aches and pains may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.