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 media â inflammation of the middle ear â often occurs as an extension of otitis externa. A middle ear infection is more likely to occur if the outer ear infection leads to a ruptured tympanum, the middle part of the ear canal where the ear drum is found. Otitis externa, meanwhile, typically coincides with other adjacent diseases or infections, like an upper respiratory infection or the common cold.