The neurological condition known as stiff person syndrome (SPS) is characterized by autoimmunity. Muscle spasms, rigidity, debilitating pain, and persistent anxiety are some of the symptoms. Muscle spasms can be so violent that they can break bones and dislocate joints.
SPS is considered a rare condition. However, misdiagnosis affects more people than previously thought. Typically, it takes seven years to identify. Multiple sclerosis, Parkinson's...