Lihasnykäykset

Lihasnykäykset, also known as fasciculations, are involuntary muscle contractions that can be observed as brief, fine twitches under the skin. These twitches are caused by the spontaneous firing of a single motor neuron and the muscle fibers it innervates. They are typically harmless and can occur in healthy individuals, often exacerbated by stress, fatigue, caffeine intake, or certain medications.

Fasciculations can affect various parts of the body, including the eyelids, limbs, and torso. While most instances are benign, they can sometimes be associated with underlying neurological conditions. Conditions such as amyotrophic lateral sclerosis (ALS), spinal muscular atrophy, or peripheral neuropathy can present with more widespread or persistent fasciculations, often accompanied by other symptoms like muscle weakness or atrophy.

The diagnosis of the cause of lihasnykäykset usually involves a thorough medical history, a physical examination focusing on neurological function, and potentially further investigations like electromyography (EMG) to assess nerve and muscle activity, or nerve conduction studies. Treatment, if necessary, is directed at the underlying cause. For benign fasciculations, lifestyle modifications such as stress reduction and limiting stimulant intake may be recommended. It is important to consult a healthcare professional if fasciculations are persistent, widespread, or accompanied by other concerning symptoms.