Muscle twitches or tremors are a common reaction to overworked muscles are are usually not harmful. The key to determining if the twitch is a problem is to note when it happens, how long it lasts and if it is accompanied by any other symptoms. You'll need to know the cause of the twitch to successfully treat it. Seek advice from a health care provider if you are experiencing serious muscle twitching.
Essential Tremor
Essential tremor is the most common form of tremor, and, if you have it, it will get worse with exercise. If your twitches are confined only to a hard workout and occur at no other time, it's unlikely that you have this neurological disorder. Even mild exercise will exacerbate an essential tremor.
Imbalances
Twitches can occur if your blood sugar gets too low during a workout or if your electrolytes get out of balance. Basic dehydration can also cause twitches and tremors. Drink water or Gatorade throughout your workout to keep the tremors from happening, or make sure to have some as soon as your workout is finished, to replace water, sugar and electrolytes that were expended during your exercise.
Vitamin B12 Deficiency
Muscle twitches due to a Vitamin B12 deficiency will get worse when you're exercising. Deficiencies are rare, but if you're a vegetarian, vegan or over the age of 55 it's possible that this is what's causing your twitching. A simple blood test will diagnose the deficiency and B12 supplements should clear up the problem.
Muscle Fatigue
If you've had a hard workout it's possible you're suffering from muscle fatigue, which simply means your muscles are tired and don't communicate well with the brain. This causes both weakness and twitching.
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