The weather changed suddenly aches and pains consider influenza, rheumatoid arthritis. 1. Influenza: Influenza is considered to be caused by influenza virus infection and other factors. Patients will show generalized pain, high fever, fatigue, headache, etc. Therefore, patients will have the symptom of body aches and pains when they are infected with influenza virus due to lowered resistance to the change of weather. 2. Rheumatoid arthritis: environmental humidity and cold are factors that trigger or aggravate rheumatoid arthritis. Patients will have symptoms such as joint pain, and thus patients will experience sudden body aches and pains when the weather changes. There are many reasons why patients may experience sudden body aches and pains when the weather changes, and it is necessary to consult a doctor in a timely manner to clarify the cause of the disease and then follow the doctor’s instructions to take appropriate measures to treat the disease.