1 Coal is a flammable black or brown organic sedimentary rock. Itâs mostly carbon and is typically found as layers (coal beds) or veins (coal seams).  Natural gas is a combustible mix of hydrocarbon gases. Itâs colourless and consists mainly of methane (CH4).
Anemia Anemia, a lack of red blood cells, can cause fatigue, pale skin, weakness, dizziness, headache and more. Mononucleosis Mononucleosis is a viral infection causing extreme fatigue, sore throat, fever, rash, muscle aches, and more.
Chicken pox can cause fever and weakness. A viral illness may cause fever and weakness in children, making them more susceptible to falls. The flu is the usually culprit of fever and weakness in a patient. Fever is typically caused by an infection or illness.