My mother is 48 years old. She has pain in fingers, wrist, elbow, knee palms and heels from around one and half years. She also have swelling on knees and elbows. Also, her left hand go numb at night. She has thyroid from 3 years and taking omee and thyroxine sodium tablets (100mg) daily morning, empty stomach. Please let me know what could be the reason and suggest the tests to be done in order to recognise it.