They are spontaneous involuntary tremors located in certain fibers of the orbital muscle, which are insufficient to move a joint. The affected muscles do not show weakness or atrophy. It is benign and self-limited and occurs in healthy individuals with spontaneous onset and disappearance, it can last up to three weeks. The most common contributing factors are excessive intake of caffeine or other exciting substances, high levels of anxiety, fatigue, tension, overtime, and a lack of sleep. The use of certain medicines and alcohol can also be involved in its appearance. In rare cases, it may appear as the first sign of facial hemi spasm, blepharospasm, Meige's syndrome, or other forms of facial dystonia.

Treatment: In most cases the appearance of myokymia is benign and self-limited, it occurs in healthy individuals with spontaneous onset and disappearance. They can sometimes last up to three weeks, but do not require treatment.