A knot typically refers to a painful swelling that appears suddenly. It represents muscle spasm, the sustained contraction of a number of muscle fibers. The muscle is irritated, either as a consequence of a strain, torn muscle fibers or a blow to the muscle. Excessive prolonged use may be the underlying cause. It may also … Read more

The appendix appears to be a residual organ, one that possibly served some purpose in our evolutionary past. It has no know function that relates to survival for modern humans. While it does contain groups of cells that are involved in immune response, these cells are ubiquitous throughout or gastro-intestinal tract. It does provide a … Read more

This phenomenon has nothing to do with the Tundra, but rather longitude. At some point in the distant past, the Earth was nudged into a position so that its axis is tilted. If you live somewhere near the equator, as the earth spins, the angle of the light that strikes the earth from the Sun … Read more

In general, menses (your period) signals that the lining of your uterus has been expelled to make room for a new home for a fertilized egg. Theoretically at least, if you have a new eggs on its way to the uterus from an ovary through the fallopian tube as you are completing your menses, and … Read more

A small amount of blood on the tissue after wiping is generally only a sign of local irritation caused by the abrasion produced by the tissue, Frequent wiping may produce this, as in the case of diarrhoea. Haemorrhoids, if present, can be irritated in the same way. If they are ruptured, they generally produce a … Read more

MCH refers to Mean Corpuscular Hemoglobin, the amount of hemoglobin in the red blood cells. If this is the only abnormality noted on a patient's CBC (complete blood count) with differential it is most likely insignificant.

Yes. Any form of Adderall (including the generic form, salts of amphetamine) produces amphetamine metabolites which will be detected by a urine drug screen. If the patient has a prescription, this is unlikely to be a problem, unless they are in the military or a pilot.