Muscle spasms can range from mild to severe. In mild cases, it might feel like your muscle is jumping around on its own. Sometimes, you might even see your muscle twitching. In severe cases, it might feel like your entire muscle stiffens up into a tight ball. (This happens a lot with leg cramps.) If a cramp is particularly painful, you might even have lingering discomfort in that area for a day or two. If muscle spasms result from a neurological condition, you may develop additional symptoms like: Muscle pain. Muscle weakness. Paralysis. Numbness. Coordination issues. Difficulty sleeping. Vision issues.