A back spasm involves a sudden, involuntary muscle contraction that can be set off by something as routine as lifting a bag or sitting for too long. Muscle fatigue, dehydration, and nerve irritation ...

Medically reviewed by Amy Kwan, PT Key Takeaways Lower back and hip pain can be caused by injuries like muscle strains and overuse from repetitive movements.Arthritis is a common cause of one-sided ...

Dystonias are neurological disorders that can cause jerky movements, muscle spasms, repetitive actions, and unusual and awkward postures. Dystonia is a type of involuntary movement, and people ...