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Causes of muscle fatigue

by Alivia Nyhan
Published: Last Updated on

The muscle fatigue is one of the most widespread diseases worldwide and is not surprising. Today’s society tends to sit longer, exercise less and sleep less, and this set of factors translates into a greater possibility of suffering muscle discomfort. It can also be the result of having made a bad gesture, having slept in a bad position or after exercising, and having natural muscle relaxants on hand can be of great help to relieve symptoms. If you are wondering why you feel weak muscles, in this FastlyHealarticle we explain the causes for which you can suffer from muscle fatigue .

What is muscle fatigue?

Muscle fatigue frames a series of symptoms that affect both the physical and psychological level in the person who suffers from it. Therefore, the mood and behavior of the person are affected by not being able to carry out normal activities, in addition to feeling physical pain. Muscle fatigue can mean the tear or breakage of a muscle, so if we feel that the symptoms are very intense we should go to a specialist. The cramps are one of the main symptoms of muscle fatigue and is mainly due to the lack of calcium and magnesium causing fatigue in the cells of the muscle tissue, ie muscle fibers are affected.

The most common symptoms of muscle fatigue are usually:

  • Irritability.
  • Muscle mobility problems.
  • Lack of elasticity.
  • Concentration problems.
  • Muscle pain.
  • Muscular weakness.


One of the most common causes that a person can suffer from muscle fatigue is strenuous training or even overtraining. In these cases, the muscles can become overloaded so they suffer for a few days or even weeks, causing punctures, pain and weakness when having to make any effort. It is essential to perform the proper stretches before each training session, as well as to hydrate during it, and to rest enough time at the end of each session. Rest between each session is essential for the muscles to replenish and prevent damage.

Lack of sleep

Rest is a fundamental part of our day to day, since it allows us to recover both physically and mentally . A lack of sleep or inadequate sleep can cause our body to suffer. In the case of exercising regularly, this part is especially relevant, since one of the causes of muscle fatigue can be a lack of rest. After each workout, our muscles need to recover, since the muscle fibers break after each session and this leads to a need to regenerate. If we do not get enough sleep, we will not let our body perform all its necessary functions to feel good the next day.


Glucose is the main fuel the body uses to generate energy. This glucose is obtained through the consumption of complex or simple carbohydrates and is stored in the tissue as a reserve. Therefore, if we spend a long time practicing a sport or doing an activity that involves exercising the muscles, the glycogen stores decrease and can be completely depleted. At this point, the muscle begins to use amino acids to generate glucose and the chances of muscle fatigue are almost certain. Therefore, it is very important to know what foods to eat before training to ensure that we have all the necessary energy and reduce the chances of feeling muscle fatigue.

Hormonal problems

Another cause of muscle fatigue may be an abnormal functioning of the thyroid gland. A decrease in the activity of this gland implies a lower amount of the thyroxine hormone that leads to hypothyroidism . In addition, the increased level of thyroxine causes fatigue of the muscles. Hyperthyroidism causes insomnia , fatigue and muscle weakness, changes in mood, frequent bowel movements, palpitations, etc. So if you detect these symptoms go to the doctor.

Other causes of muscle fatigue


The anemia is a lack of red blood cells in which the required amount of oxygen does not reach the blood cells. This lack of oxygen in the blood cells can be another cause of muscle fatigue, in addition to spontaneous dizziness, chronic fatigue, sensitivity to cold or arrhythmias.

Potassium overdose

Potassium overdose, known as hyperkalaemia, are the consequence of an increase in the supply, redistribution or decrease of renal excretion, and pose a risk of suffering arrhythmias. This excess of potassium manifests itself with symptoms such as muscle fatigue, abdominal pain, anxiety, nausea and vomiting, and irritability, among others.

This article is merely informative, at FastlyHeal .com we do not have the power to prescribe medical treatments or make any type of diagnosis. We invite you to see a doctor in the case of presenting any type of condition or discomfort.

If you want to read more articles similar to Causes of muscle fatigue , we recommend that you enter our Bones, Joints and Muscles category .

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