A virus can attack a muscle on its own or discharge substances that injure muscle fibers. A viral infection of the muscle is called viral myositis. The types of viruses that can potentially attack muscles include HIV, the common cold and flu viruses, explains WebMD.Continue Reading
A bad cold, flu or pneumonia can cause muscle pain due to coughing, which is often mistaken as an attack on the muscle itself. However, in rare cases, a serious viral infection can spread from the respiratory or digestive tract to other parts of the body, including the muscles. These infections can affect single muscle groups, such as the back or shoulders, or the entire skeletal muscle system as a whole. Pain, inflammation and weakness are the most common symptoms, and they can occur quickly, making it difficult to get out of bed, according to WebMD.
Treatment of viral myositis includes antiviral drugs, hydration, bed rest and steroids to decrease inflammation. Although viral myositis can be caused by influenza and other common infectious viral diseases, the main cause is human immunodeficiency virus, notes Nancy F. Crum-Cianflone in an article in Clinical Microbiology Reviews.
If unexpected muscle pain or prolonged muscle pain in association with a cold, flu or other viral infection is experienced, a physician may run a series of tests such as blood tests, a muscle biopsy, EMG or MRI, states WebMD.Learn more about Conditions & Diseases
The use of certain drugs, especially in large doses, can lead to the death of muscle fibers that then enter the bloodstream and cause drug-induced rhabdomyolysis, notes WebMD. People who have the condition cannot filter waste and urine properly through their kidneys and may experience complications such as kidney failure and, in rare cases, death.Full Answer >
Rhabdomyolysis is a syndrome caused by the breakdown of muscle fibers. The death or breakdown of the muscle releases a protein called myoglobin into the bloodstream, which can lead to fatigue, muscle weakness and kidney failure, according to Healthline.Full Answer >
Polymyositis is a muscle disease that causes the muscle fibers to become inflamed, according to MedicineNet. The disease occurs when white blood cells invade the muscles spontaneously, causing inflammation. As of 2015, the diseaseﾒs cause is unknown.Full Answer >
The University of Washington describes a motor unit as consisting of a somatic motor or efferent neuron and all the muscle fibers or cells it stimulates or innervates. An efferent axon reaches the muscle, where it forms branches and synapses with several muscle cells.Full Answer >