There are many reasons for muscle pain in hands and feet, such as fatigue, influenza, low blood potassium, rheumatoid arthritis and so on. 1. Exhaustion: overworked body strenuous exercise, long-term posture and other reasons, may cause muscle ligament or soft tissue contusion, muscle strain, etc., causing muscle pain in hands and feet. 2. Influenza: Influenza or parainfluenza viral infections can cause generalized muscular toxicity due to viral attacks on the body, which may also cause muscle aches and pains in the hands and feet. 3. Hypokalemia: A lower-than-normal serum potassium concentration may also cause muscle aches and pains in the hands and feet, as well as weakness and other symptoms. 4. Rheumatoid arthritis: Rheumatism or rheumatoid arthritis may affect the local blood circulation of the limbs and affect the venous return, which may also lead to muscle pain in hands and feet. Muscle pain in the hands and feet may have other reasons, need to go to the hospital in time to check, clear cause.