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The biological meaning of asthenia is as follows:

An indication of overwork. If we are overworked beyond our strength, or have experienced a night without sleep, the first thing that will happen to our body is an asthenic state. Weakness, increased fatigue, unstable mood, increased sensitivity to loud sounds, bright lights, strong smells, inability to stand the usual loads. All of this will pass after proper rest and isolation from external stimuli. This and other symptoms are sometimes he

lped with:
A protective reaction of t

he nervous system. Asthenia is a protective mechanism inherent in the process of evolution in every healthy person, which allows the nervous system and the psyche to protect itself from destructive external or internal influences. It is based on the reflex of inhibitory inhibition. When a potentially dangerous impact on the body grows in strength, this protective reflex is activated through asthenia. For example, a student in the last days before an exam tries to absorb a huge amount of material for the semester, reading for several hours without interruption, begins to notice that attention drops, the reading does not get absorbed, “his head is buzzing,” etc. Asthenia in this case resembles the body’s protective inflammatory reaction to the ingress of a foreign agent, only inflammation and fever are a reaction of the immune system, and asthenia is a reaction of the nervous system.
Illness. Many diseases begin with asthenic symptoms: infections and inflammations, hypertensive or hypotensive disease, liver or kidney failure, diabetes, schizophrenia, cancer, etc. The first hours of the flu virus are most indicative: irritability and hypersensitivity, inattention, headache and drowsiness appear even before the fever. Some diseases are limited to only asthenic symptoms: a mild concussion, a hypertensive crisis, an alcoholic hangover, coming out of anesthesia. In many diseases, the initial stage of asthenia will be replaced by other symptomatology, after recovery, asthenic symptoms may be observed again.
Thus, asthenia has two main external causes: overwork and various diseases. And one internal – a reaction of the nervous system.
The term asthenia is commonly used for states of overwork, and asthenic syndrome is used to state a painful condition.

The symptoms of asthenia (the main ones) are
Feeling of fatigue, impotence, malaise, in which rest does not bring relief;
inattention, inability to concentrate, poor assimilation of new material, getting stuck on small unimportant details when talking or reading;
increased distractibility, it is easy to lose track of a conversation or reflection;
irritability, unstable moods, and easily developed tearfulness;
Hypersensitivity to sounds, smells, light, touch, taste;
disturbed sleep, difficulty falling asleep, early awakening, sleepiness during the day, lack of sleep after awakening;
headaches and dizziness;
increased anxiety;
worsening of condition when the weather changes or when staying in a hot room;
vegetative disorders: palpitations, pressure fluctuations, sweating, feeling of shortness of breath, discomfort in different parts of the body.
What to do in case of asthenic conditions
The first and most natural step is rest and isolation from external stimuli. In many cases, this allows you to get rid of the asthenic state completely.
In other cases, when asthenia is a manifestation of a disease, in addition to rest you will need the help of a doctor to clarify the condition, identify the causes and mechanism of development, and prescribe treatment.