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, also known as acute external otitis, swimmer's ear, or tropical ear is an infection of the skin covering the outer ear canal that leads to the ear drum, called the tympanic membrane.igns and symptoms may include: Acute diffuse otitis externa-the swelling (inflammation) of the ear canal is more extensive. A rash can extend to the pinna (outer ear) and tympanic membrane (ear drum). Acute in this text means the otitis lasts no more than three weeks.