Dizziness, along with vertigo, may also exist and present themselves as signs of fatigue in a person. Vertigo is a condition when the person feels that the world around him or his surrounding is spinning. So, a damaged or reduced spatial perception and stability along with a spinning sensation may be pointers of fatigue. When the body is unable to deal with tiredness and lack of energy, it shows the same through means of dizziness and vertigo.

Frequent mood swings, irritability and a heightened temper may be present in a fatigued person. Since the person lacks energy and remains tired, so any small change in plan or petty issue can trigger this mood change and irritability. Since there is already lack of energy in the person suffering from fatigue, he is unable to deal with any changes that his mind has to work on or put in additional effort. All these affect the temperament of the person making his moods fluctuate.

A person suffering from fatigue may also experience fast heartbeat or palpitation. There may or may not be any additional reason for the palpitation and it may occur all of a sudden. This palpitation often lasts from a few hours to a few days. Palpitation or fast heartbeat leads to an uncomfortable, racing feeling that occurs when the heart does not follow its normal rhythm. This occurs in fatigue when the affected person feels stressed (mentally or physically) due to improper rest or other strenuous conditions.

Fainting or losing consciousness completely may be experienced by a fatigued person. Apart from that, a person may also experience a condition wherein partial consciousness is lost, i.e., the person is near to losing consciousness but does not lose it completely. Fainting, or nearly fainting, happens when the brain does not receive adequate blood supply from the body.

Concentrating on a particular work becomes difficult when a person is suffering from fatigue. The mind easily diverts to other things, hampering progress of work. Thus, it becomes difficult to start or finish a particular task when a person is suffering from fatigue. Lack of concentration also extends to not being able to pay attention to any particular situation that needs immediate or fast handling. As a result, a fatigued person is also not in a position to make correct judgements or decisions. Fatigue, whether it’s physical or mental, reduces the mental strength and capabilities due to lack of energy that help the brain function properly. Hence, problems like lack of concentration, short term memory loss, inability to take decisions, etc. rear their head.

Feeling drained of energy, tired and completely exhausted are other primary signs of fatigue. Lack of energy and tiredness makes a person lethargic, and reduces the motivation to perform any task. A fatigued person may not have the energy or the willingness to perform even the day-to-day tasks. The person may also feel sleepy almost always. Due to insufficient rest and exertion or other medical conditions, the energy of a person is not properly utilized which leads to all the above mentioned problems.

Feeling weak is a prominent sign of fatigue. An affected person does not seem to have strength left for any work. Though, how weak a person feels varies from person to person and on the level of fatigue experienced. Along with general weakness, a sufferer may also experience muscle weakness. Insufficient energy leads to a feeling of weakness in a fatigued person.