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2. Neurasthenia - Wikipedia

   en.wikipedia.org/wiki/Neurasthenia

   Neurasthenia (from the Ancient Greek νεῦρον neuron "nerve" and ἀσθενής asthenés "weak") is a term that was first used as early as 1829 [6] for a mechanical weakness of the nerves. [clarification needed] It became a major diagnosis in North America during the late nineteenth and early twentieth centuries after neurologist George ...

3. Fatigue - Wikipedia

   en.wikipedia.org/wiki/Fatigue

   Fatigue in a medical context is used to cover experiences of low energy that are not caused by normal life. [2] [3]A 2021 review proposed a definition for fatigue as a starting point for discussion: "A multi-dimensional phenomenon in which the biophysiological, cognitive, motivational and emotional state of the body is affected resulting in significant impairment of the individual's ability to ...

4. Lethargy - Wikipedia

   en.wikipedia.org/wiki/Lethargy

   Lethargy. Lethargy is a state of tiredness, sleepiness, weariness, fatigue, sluggishness, or lack of energy. It can be accompanied by depression, decreased motivation, or apathy. Lethargy can be a normal response to inadequate sleep, overexertion, overworking, stress, lack of exercise, improper nutrition, drug abuse, boredom, or a symptom of an ...

5. Why Am I Tired All the Time? We Have a Few Answers - AOL

   www.aol.com/why-am-tired-time-few-201000577.html

   How to Know If Feeling Tired All the Time Is a Problem. ... While symptoms vary depending on the disease, fatigue appears in all of them. ... older than 60, have had thyroid surgery or treatments ...

6. Here's The Biggest Symptom Of Walking Pneumonia To Look Out ...

   www.aol.com/heres-biggest-symptom-walking...

   Those symptoms include: Feeling tired. Fever. Chills. Cough. Shortness of breath. “The biggest symptom to look out for is shortness of breath,” says infectious disease expert Amesh A. Adalja ...

7. Vitamin B12 deficiency - Wikipedia

   en.wikipedia.org/wiki/Vitamin_B12_deficiency

   6% (< 60 years old), 20% (> 60 years old) [4] Vitamin B12 deficiency, also known as cobalamin deficiency, is the medical condition in which the blood and tissue have a lower than normal level of vitamin B 12. [5] Symptoms can vary from none to severe. [1] Mild deficiency may have few or absent symptoms. [1]