What causes muscle weakness and pain in arms?

Condition analysis:
Many conditions, including injuries, metabolic diseases, neuromuscular diseases and toxins in the body, can cause pain and weakness in the arms, according to MedicineNet. Weakness describes a lack of strength or loss of muscular function and should not be confused with fatigue, which refers to tiredness.

Weakness is determined by an individual's ability to exert the arms, legs and other muscles with normal effort. Overexertion is often the cause of sore muscles, and muscle weakness typically subsides within a day or two. In some cases, a mineral deficiency, such as that of iron or potassium, may bring on the condition. Hypothyroidism, which is caused by low thyroid levels, and hyperthyroidism, which results from high thyroid levels, may disrupt the body's normal use of energy, causing weakness, fatigue, weight changes, moods and sensitivity to temperature.

Muscle loss that comes on suddenly may indicate a stroke or serious nerve problem. In rare cases, Guillain-Barré syndrome, a nerve disorder that can lead to paralysis, and Myasthenia gravis, which causes rapid muscular fatigue, causes muscle weakness.

Instructions:
Nuts: Nuts provide healthy, unsaturated fat, which provides energy for low to moderate intensity exercise, and vital nutrients, such as magnesium. Magnesium is necessary for over 300 chemical reactions in your body, according to the Office of Dietary Supplements. It also plays an important role in muscle function. Because of this, a magnesium deficiency can cause muscle weakness. Nuts particularly rich in magnesium include hazelnuts, macadamia nuts, almonds, cashews, peanuts, pine nuts and walnuts. Nut butters, such as peanut and almond butters, also provide valuable amounts.