Psoriastic arthritis:

This condition, in particular affects, even though not exclusively, the distal interphalangeal joints and a topographical relationship may exist between the nail and the changes in the distal joint.

The affectedness of these joints accompanied some times by tenosynovitis gives the toe the appearance of a sausage. The distal joints of the toes of the feet are affected in a similar manner.

Rheumatoid arthritis

Rheumatoid arthritis may cause a severe and very persistent pain in the feet including when weight is born on them. The metatarsalphalangeal joints and the toes of the feet frequently become swollen, the feet are sweaty and hot, and sensitivity to pressure exists to pressure on the metatarsals when the tips of them are laterally compressed.

In these instances, it is fitting to rest, to put heat on and to make gentle exercises in order to impede the symptomatology of the flat foot.. Analgesics may be required.

Gout (Hyperuricemia)

Frequently, gout attacks the first metatarsalphalangeal joint.

The beginning of it is sudden, up until the point, that an acute infection from cocos is suspected.

When it attacks, temperature is elevated. The patient cannot sleep and might sit with the foot elevated and with soft house slippers. Generally, this appears in men who have a tendency to drink.

Normally, the acute attack stops after several days and then leaves the skin to peel off on top of the foot. During the attacks, the joint is completely normal and serous uric acid is elevated during some phase of the illness.

Noisy leg syndrome

When a physician is unfamiliar with this condition, and encounters a patient who presents with this syndrome, he appears to be confused. Commonly, the person that suffers from the condition tells the physician that the symptoms are difficult to describe: some say that their legs feel heavy or light, or agitated or moving. Drs. Boghen and Péyonnard, after observing several patients, define the condition as "imprecise and unpleasant profound sensations in the legs that produce the urgent need to move them". But unfortunately, nothing can be contributed or almost nothing with respect to treatment and it is up to the patient, who through his own experience, has to find the ways to alleviate it.

Erythromelalgia

This is a condition, characterized by a crisis of pain, ruddiness and hyperthermia in the extremities, with absolute integrity of the circulation.

The painful crises are triggered with physical exercise and they worsen with cold. The skin then turns read, the veins expand, including they might have a slight edema and they might present with an increase in local temperature.

Reflex sympathetic dystrophy

This dystrophy consists in a circulatory disorder of limbs as a consequence of something traumatic. It occurs in individuals with a special predisposition to pain of a psychic origen. It is characterized by a persistent and abnormal vasodilation, independent of the inflammatory process.

Clinically, it is expressed by intense pain that increases at the slightest movement of emotive change; it is accompanied by edema, which with pain, can be extended far from the lesions The skin begins to atrophy, the joints stiffen and pain is propagated until the root of the affected limb.