What should you know about lithium restless legs?

Restless legs usually involve an urge to move the legs with uncomfortable sensations that begin or worsen during rest, especially in the evening or at night. Movement may bring temporary relief and sleep can suffer. Lithium is not the only possible explanation for new symptoms. Low iron stores, chronic kidney disease, peripheral neuropathy, pregnancy, some medicines and other sleep problems can contribute. A clinician will consider timing, dose changes and the full symptom pattern rather than assuming a single cause.

Do not stop lithium or change its dose on your own. Keep a brief record of when sensations start, whether movement helps, sleep disruption, caffeine or alcohol use and any recent medicine changes. Ask for a review of lithium treatment and whether blood tests, including an iron assessment and checks related to kidney health, are appropriate. Gentle movement, stretching, a regular sleep routine and limiting evening caffeine may reduce discomfort for some people.

Arrange medical review if symptoms repeatedly disturb sleep, spread to the arms, cause skin injury from scratching or begin soon after a lithium change. Seek urgent help for severe shaking, confusion, marked drowsiness, unsteady walking or repeated vomiting, which may indicate lithium toxicity rather than restless legs. Get emergency care for sudden one-sided leg swelling, warmth, severe pain or breathlessness.

Ask whether your symptoms fit restless legs, whether lithium or another medicine could contribute, and which tests can check iron, kidney function and nerve health. Discuss safe treatment options and what symptoms should trigger an urgent call.