Prominent among constitutional diseases is the one known as rheumatism. It is characterized by certain local symptoms or manifestations in fibrous tissues. This term has been applied to neuralgic affections and to gout, but it differs from each in several essential particulars. Rheumatism may be divided into (1) Acute, (2) Chronic, (3) Muscular.

Acute Articular Rheumatism. Acute articular rheumatism implies an affection of the articulations or joints. It usually commences suddenly; sometimes pain or soreness in the joints precedes the disclosure of the disease. The symptoms are pain in the joints, tenderness, increased heat, swelling and redness of the skin. The pain varies in its intensity in different oases, and is increased by the movement of the affected parts. Swelling of the joints occurs, especially those of the knee, ankle, wrist, elbow, and the smaller joints of the hands and feet. The swelling and redness are generally in proportion to the acuteness of the attack. Acute articular rheumatism is always accompanied with more or less fever. Sweating is generally a prominent symptom, being strongly acid and more profuse during the night. The appetite is impaired, the tongue is coated, the bowels are constipated, or there is diarrhea.

The Duration of this Disease. Unlike fevers, its course is marked by fluctuations; frequently after a few days the pain subsides, the fever disappears, and convalescence is apparently established, when, suddenly, all the symptoms are renewed with even greater intensity than before. This disease rarely proves fatal, unless the heart is involved.

Causes. Rheumatism is frequently supposed to be occasioned by a suppression of the functions of the skin, and is generally attributed to the action of cold upon the surface of the body. But this acts only as an exciting cause. It is a disease of the blood. This form of rheumatism usually occurs between the age of fifteen and thirty, and prevails most extensively in changeable climates. Acute articular rheumatism seldom terminates in the chronic form.

Chronic Articular Rheumatism. Articular rheumatism, in the subacute or chronic form, is frequently observed in medical practice. The symptoms are pain and more or less swelling of the joints, although not of as grave a character as in acute rheumatism. There is frequently an absence of increased heat and redness. As in the acute form, the different joints are liable to be affected successively and irregularly, until, after a time, the disease becomes fixed in a single joint, and the fibrous tissues entering into the ligaments and tendons are liable to be affected. The appetite, digestion, and nutrition are often good, and, in mild cases, patients are able to pursue their daily vocations. The disease is supposed to be the same as in the acute form, but milder, and, strange to say, more persistent. A diseased condition of the blood is supposed to be involved in both instances, but this morbid state is less extended, and, at the same time, more obstinate in the chronic than in the acute form. Sub-acute articular rheumatism is not always chronic, and may disappear in a shorter time than in the acute form. Chronic articular rheumatism is not generally fatal, but there is danger of permanent deformities.

Muscular Rheumatism. This affection is closely allied to neuralgia, and may properly be called myalgia. It exists under two forms, acute and chronic. In acute muscular rheumatism, there is at first a dull pain in the muscles, which gradually increases. When the affected muscles are not used the pain is slight, and certain positions may be assumed without inducing it constantly; but in movements which involve contraction of the muscles the pain is very violent. In some cases, the disease is movable, changing from one muscle to another, but usually it remains fixed in the muscle first attacked. The appetite and digestion are not often impaired, and there is no fever. The duration of this form of rheumatism varies from a few hours to a week or more.

In subacute or chronic muscular rheumatism, pain is excited only when the affected muscles are contracted with unusual force, and then it is similar to that experienced in the acute form. The chronic form is more apt to change its position than the acute. The duration of this form is indefinite. In both the acute and chronic forms some particular parts of the body are more subject to the affection than others.

The muscles on the posterior part of the neck are subject to rheumatic affection. It is termed torticollis or cervical rheumatism in such cases, and should be distinguished from ordinary neuralgia. When the muscles of the loins are affected, it is commonly known as lumbago. In case the thoracic muscles are affected, it is known as pleurodynia. In coughing, sneezing, and the like, the pain produced is not unlike that in pleuritis and intercostal neuralgia.

One of the most marked features of muscular rheumatism, is the cramp-like pain, induced by the movements of the affected muscles, whereas the pain is slight when those muscles are uncontracted. This feature is very serviceable in distinguishing muscular rheumatism, or myalgia, from neuralgic affections. Another trait which distinguishes muscular rheumatism from neuralgia, is that the former is characterized by great soreness, while the latter is not. There is also a distinction between inflammation of the muscles and muscular rheumatism. In the case of the former, there is continued pain, swelling of the parts, occasional redness, and the presence of more or less fever, which conditions do not exist in the latter. Persons subject to rheumatism of the muscles, are apt to suffer from an attack, after exposure of the body to a draught of air during sleep, or when in a state of perspiration.

Treatment of Acute Rheumatism. Administer the spirit vapor-bath to produce free perspiration, which should be maintained by full doses of the Compound Extract of Smart-weed. The anodyne properties of the latter also prove very valuable in allaying the pain. Tincture or fluid extract of aconite root may also be employed, to assist in equalizing the circulation, and also to secure its anodyne action. Black cohosh seems to exert a specific and salutary influence in this disease, and the tincture or fluid extract of the root of this plant may be advantageously combined with the aconite. Take fluid extract of aconite-root, thirty drops; fluid extract of black cohosh, one drachm; water, fifteen teaspoonfuls; mix. The dose is one teaspoonful every hour. The whole person should be frequently bathed with warm water, rendered alkaline by the addition of saleratus or soda. The painful joints may be packed with wool or with cloths wrung from the hot saleratus water, and the patient kept warm and quiet in bed. The acetate of potash taken in doses of five grains, well diluted with water, every three or four hours, is very valuable in acute rheumatism. Its alkaline qualities tend to neutralize the acid condition of the fluids of the system, and it also possesses diuretic properties which act upon the kidneys, removing the offending blood-poison from the system through these organs. If the joints are very painful, cloths wet with the Compound Extract of Smart-weed and applied to them, and covered with hot fomentations, very frequently relieve the suffering. The majority of cases yield quite promptly to the course of treatment already advised, if it is persevered in. The disease, however, sometimes proves obstinate and resists for many days the best treatment yet known to the medical profession.