Compression of nerves may cause pain in distant parts.

Irritation of the biliary or urinary passages may cause nausea and vomiting.

Inflammation of the neck of the uterus or misplaced uterus may cause pain in the back of the head.

Excitement may produce paralysis, fainting, and other nervous derangements.

Red cheeks and lung irritation go together. Red cheeks may accompany congestion of lungs and hepatic colic.

Salivation goes with irritation of the stomach. Excessive flow of urine accompanies sciatic neuralgia. Stricture of the urethra, cystic irritation, and prostatic irritation may cause pain in the sciatic nerve.

Hepatic colic causes change in the circulation of the blood in lungs. The heart is also influenced. It may become insufficient, systole occurs, and edema may follow.

The kidneys affect the heart; the heart affects the lungs; the liver and the kidneys affect themselves.

The physician should trace the successive changes that take place. It is necessary to know the morbid sympathies. It should not, however, be understood that organs take on disease per se.

The cause of an organ becoming diseased is usually abuse of some kind. The stress of life rests more heavily on one organ than on another. Whenever an organ goes wrong, others are affected through sympathy. Then, after functional derangement has gone on for a certain length of time, organic changes take place; after which organic disease becomes a cause of other affections.