Causes of impaired sensitivity
Sensitivity disorders can be manifested by symptoms of depression (weakening or absence of one or more kinds of sensitivity) and /or symptoms of amplification (abnormal sensations in the form of paresthesias, like tingling or numbness, or hypersensitivity to sensory stimuli-pain, hyperesthesia).
Causes: pathological processes that damage peripheral receptors located in various tissues and organs, sensitive fibers of peripheral nerves, afferent ways of the spinal cord and brainstem, thalamus and cortical centers in the parietal lobe.
The causes of various types of sensitivity disorders, depending on the damage to the nervous system. Short-term and transient paresthesias do not indicate damage to the nervous system.
Diagnosis of sensitivity violation
1. Subjective and objective examination: the type, severity, circumstances of occurrence and localization of sensitivity disorder should be assessed. Tactile sensitivity is investigated by touching the body with a piece of thin paper or cotton wool on a stick, pain sensitivity with a needle, sensation of temperature using two test tubes with warm and cold water (from a tap). Investigating the sensitivity, compare it to symmetrical parts of the body, determine as accurately as possible the boundaries of sensitivity disorders and compare them with the areas of innervation of individual peripheral nerves and individual dermatomes.
2. Auxiliary studies: neuroimaging (CT, MRI) of the brain and /or spinal cord, electrophysiological studies (sensory conduction, induced sensory potentials) depending on the suspected site of injury.