The causes of body and muscle fatigue differ from one person to another, and range from transient and slight to serious and emergency. Here are the most important causes of body and muscle fatigue

Causes of body and muscle fatigue
Among the most important and well-known causes of body and muscle fatigue are the following:

1- Allergies of all kinds
One of the common causes of body and muscle fatigue is allergies, whether seasonal allergies, allergic rhinitis, or even food allergies. There are many allergens that may cause symptoms to increase severely and thus feel tired, such as: pollen scattered in the air, and insects such as; Dust mites, weather changes.
Also, body fatigue may be one of the apparent symptoms of allergy to a particular type of food, and there are many medications that help relieve allergy symptoms, and knowing and avoiding foods that cause allergies also helps prevent body fatigue.

2- Poor blood circulation
You may feel tired in the body and muscles in general, and in the feet in particular, as a result of poor blood circulation and not flowing as it should in different parts of the body, especially the lower half of the body.

Therefore, it is preferable to maintain your activity during the day and avoid wearing tight clothes, in addition to keeping some diseases that may have caused poor blood circulation under control, especially diabetes (Diabetes).

3- Having a chronic disease
One of the causes of body and muscle fatigue is one of the following chronic diseases:

Peripheral artery disease: where blood flow in some blood vessels becomes difficult, which leads to a lack of sufficient blood supply to the muscles of the body for their activity.
Lung diseases: Some lung diseases may cause the respiratory system to be unable to supply enough oxygen to the body, which causes constant fatigue.
Diabetes: Many complications of diabetes cause constant fatigue in the body if the disease is not controlled.
Multiple Sclerosis: Body and muscle fatigue is the most common symptom of this disease.
Heart diseases, especially heart failure: These diseases cause the heart’s inability to provide the body with sufficient blood and oxygen, which causes permanent fatigue.
Kidney disease: Any defect in the ability of the kidneys to drain toxins from the body may cause a feeling of permanent fatigue and exhaustion.
Anemia: Because there is not enough blood in the body, the muscles do not get enough of the necessary oxygen.
Rheumatoid arthritis: This disease is one of the common causes of constant feeling of tiredness and fatigue, especially because of the resulting damage to the joints if the disease is not controlled properly.
4- Muscle overuse or underuse
One of the main causes of body and muscle fatigue is not using the muscles enough, being lazy or even sitting and staying in the same position for long periods of time.

If the muscles are not used on a daily basis as it should, the body begins to replace some muscle tissue with fatty tissue, which can be reversed if you start exercising and physical activity on a daily basis, especially in your twenties and thirties.

Muscle overuse, such as in the case of intense and strenuous exercise, can also cause body and muscle fatigue and extreme fatigue.

5- Sleep disturbances
The presence of any problems and disorders that hinder sleep at night or reduce its quality is one of the causes of common body and muscle fatigue, and these are the most important problems that may cause a lack of sleep:

Insomnia and chronic anxiety.
Chronic pain.
restless leg syndrome.
Working night shifts.
Sleep apnea syndrome.
6- Causes of body and other muscle fatigue
In addition to all of the above, there are also many other reasons for body and muscle fatigue, and these are some factors, cases and diseases that may be accompanied by a feeling of constant fatigue:

Thyroid diseases.
Autoimmune deficiency disease, also known as AIDS.
Chronic fatigue syndrome.
Heart attack and stroke.
Addison’s disease.
Deficiency of minerals and vitamins.
Take certain medications.

Symptoms that may indicate a heart condition, and should not be ignored.
If you feel you present with a new abnormal symptom, especially if you have certain known risk factors for coronary artery disease, seek medical attention.
50% of those who have a cardiac arrest have warning symptoms over a period of days or weeks.

These symptoms include chest pain, shortness of breath, dizziness, fainting, and heart palpitations.

Prompt diagnosis and early treatment of a heart attack is essential to saving a patient’s life.

However, in many cases, a heart attack begins as mild pain or discomfort. Symptoms can come and go, and then come back.

Heart disease is the number one cause of death for both men and women, and causes 40% of all deaths. But why is heart disease so fatal? One reason is that people do not seek immediate help as soon as the first symptoms appear. But cardiac symptoms may not always be clear or apparent, and may vary from person to person, and from one gender to another.

Because of this, it can be difficult to understand cardiac symptoms. You should not ignore any of the warning signs, wait for them to disappear without treatment or relate them to conditions such as heartburn, muscle sclerosis, or other non-cardiac causes.

This is especially true for men, those over the age of 65, and those with heart risk factors. High cholesterol levels, high blood pressure, obesity, smoking, and a family history of heart disease are some of the risk factors for heart attack, stroke, and heart failure.