The cause of muscle cramps isn't always known. Muscle cramps may be brought on by many conditions or activities, such as: 1  Exercising, injury, or overuse of muscles. 2  Pregnancy. 3  Cramps may occur because of decreased amounts of minerals, such as calcium and magnesium, especially in the later months of pregnancy.
Causes of Otitis externa. Causes of Otitis externa. Otitis externa is caused by a bacterial or viral infection in the external part of the ear canal. A common bacterial pathogen is Pseudomonas aeruginosa. List of causes of Otitis externa. Otitis externa Causes: Risk Factors.
Otitis Externa (outer ear infection) or swimmers ear. Otitis Externa. In general terms otitis externa (commonly called swimmers ear) is an inflammation of the skin of the auditory canal. This is usually a primary infection, but can occur as the result of discharge from the middle ear.Distinguishing this, especially in children can be difficult.titis Externa. In general terms otitis externa (commonly called swimmers ear) is an inflammation of the skin of the auditory canal. This is usually a primary infection, but can occur as the result of discharge from the middle ear. Distinguishing this, especially in children can be difficult.