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.
There are three types of external otitis, including swimmer's ear. Acute diffuse otitis externa, or swimmer's ear. This is a diffuse infection of the ear canal and the most common type of otitis externa. It can last up to 3 weeks, and involves swelling, or inflammation, of the entire ear canal. A rash can extend to the outer ear and the ear drum.