Discussion: I suffer from an autoimmune disease. Why am I always tired?

In patients with autoimmune diseases, fatigue is metabolic primarily due to tissue damage, which the body accidentally attacks. Chronic inflammation can create a condition of chronic metabolic fatigue.

In practice, a distinction can be made between four types of fatigue:
1 Muscle fatigue - (Muscles) Often due to muscles' exertion (not necessarily aerobic). Such as holding a child in your arms and standing still. Muscle fatigue is a result of lactic acid formation. Usually, within a few minutes, the pain will go away.
2 Aerobic fatigue—(Heart and Lungs) Fatigue results from physical exertion, sports activities, climbing stairs, carrying loads, etc. It is often associated with a high heart rate, rapid breathing, muscle aches, and sweating. Aerobic exertion activates the heart and lungs, increasing the pulse and respiration rate. Sweating is a mechanism designed to cool the body.
3 A heavy meal or chronic inflammatory diseases often cause metabolic fatigue (Liver, kidney, Immune system). One manifestation of metabolic fatigue is a desire to take a nap.
Metabolic fatigue is fatigue of the liver and kidneys that work very hard, usually after large meals. The liver is the most energetic organ in the human body! The need for drowsiness reflects the direct connection between the liver and the eyes. (According to Chinese medicine)
4 Spiritual and mental fatigue (Brain and subconscious) usually occurs after unpleasant or traumatic events. The manifestation of mental fatigue is a poor mood, a tendency to outbursts, closure, and social distance.
The brain is energetic; unpleasant and traumatic events are often stored subconsciously (as part of the mind's defense mechanism). These processes impair mood and the body's general energy level.

Link: Immune system boost and rehabilitation.
https://www.sf-healing.com/page/109 (Copy & Paste)