Arm muscles aid in contraction and relaxation of the hand. Any damage or injury to the muscles can cause pain, inflammation and weakness in the region. In most cases, the condition is temporary and mild. Adequate rest will allow the muscles to self-repair. In other instances, a medical examination can detect the cause for weakness.

General causes for arm muscle weakness are:

• Excessive Exercise: This is a temporary side effect of excessive exercising. An increased pressure on the arms can lead to insufficient circulation of oxygen. In an attempt to produce energy, the muscles will try to generate energy by anaerobic respiration. In this process, lactose, the end product of anaerobic respiration is built up in concentrated proportions causing muscle fatigue and tiredness making it feel weak. This condition is temporary and eases after a couple of hours.
• Muscle Injury: A tear in muscles can lead to decreased work output of the hand causing weakness. Rest and adequate medications will get the arms back on track.
• Dehydration: Insufficient liquid consumption will cause the cells to shrink and shrivel up all over the body. Excess dehydration will make the body lose suppleness and reduce functioning of various organs. This leads to overall fatigue of hands and legs.
• Diabetes: A raised blood glucose level causes diabetes. This leads to decreased work efficiency of various organs causing fatigue and malaise of the body.
• Neurological Disorders: In rare cases, Parkinson’s disease, Lou Gehrig’s disease can also result in muscle weakness in the hands and legs. However, these symptoms are usually observed in the elderly.

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