Muscle spasm is an involuntary contraction of a muscle that can cause a great deal of pain. When the facet joints of the spine become injured or inflamed, the muscles supporting the spine can spasm causing low back pain and limitation in motion.

Muscle spasm is typically treated conservatively with muscle relaxants and exercise therapy. Muscle relaxants inhibit painful contractions by sedating the muscle, while exercise stretches the muscles so they are less likely to strain, tear or spasm.

Applying heat therapy using a heat pad may also help relax muscle spasms

Symptoms

Most muscle cramps develop in the leg muscles, particularly in the calf. Besides the sudden, sharp pain, you might also feel or see a hard lump of muscle tissue beneath your skin.

• Cause severe discomfort
• Are associated with leg swelling, redness or skin changes
• Are associated with muscle weakness
• Happen frequently
• Don’t improve with self-care
• Aren’t associated with an obvious cause, such as strenuous exercise

Causes

Overuse of a muscle, dehydration, muscle strain or simply holding a position for a prolonged period can cause a muscle cramp. In many cases, however, the cause isn’t known. Although most muscle cramps are harmless, some may be related to an underlying medical condition, such as:

• Inadequate blood supply. Narrowing of the arteries that deliver blood to your legs (arteriosclerosis of the extremities) can produce cramp-like pain in your legs and feet while you’re exercising. These cramps usually go away soon after you stop exercising.
• Nerve compression. Compression of nerves in your spine (lumbar stenosis) also can produce cramp-like pain in your legs. The pain usually worsens the longer you walk. Walking in a slightly flexed position — such as you would use when pushing a shopping cart ahead of you — may improve or delay the onset of your symptoms.
• Mineral depletion. Too little potassium, calcium or magnesium in your diet can contribute to leg cramps. Diuretics — medications often prescribed for high blood pressure — also can deplete these minerals.

How are muscle spasms treated?

First, stop doing whatever triggered the muscle spasm then:

• Gently stretch and massage the spasmodic muscle.
• Hold it in a stretched position until the spasms stop.
• Apply cold to sore/tender muscles or heat to tense/tight muscles.

If the muscle spasm is severe, happens frequently, responds poorly to treatment, and is not related to obvious causes, make an appointment with your doctor. The spasms could be related to underlying factors.

Risk factors

Factors that might increase your risk of muscle cramps include:

• Age. Older people lose muscle mass, so the remaining muscle can get overstressed more easily.
• Dehydration. Athletes who become fatigued and dehydrated while participating in warm-weather sports frequently develop muscle cramps.
• Pregnancy. Muscle cramps also are common during pregnancy.
• Medical conditions. You might be at higher risk of muscle cramps if you have diabetes, or nerve, liver or thyroid disorders.