Fecal incontinence occurs because of an underlying disease or illness (it is not considered a disease). There are numerous potential causes and many patients have more than one reason to cause loss of bowel control. Damage to muscles and nerves may occur directly at the time of vaginal childbirth or after anal or rectal surgery.
Joints affected in RA. General symptoms in RA. In addition to symptoms affecting the joints, several other symptoms are common in patients with RA. Patients may experience a general soreness, aching, and stiffness affecting the entire body. RA is commonly associated with fatigue and weakness, a feeling of sickness or malaise, as well as persistent low-grade fever.
1 Drug reactions: Weakness may be a side effect of drugs such as steroids, heart medicine, or muscle relaxants. Alcohol or illegal drugs can also cause weakness.  Prolonged lack of motion: Parts of your body may become weak if you have not moved them for a long time.