There are about 2,500 BTU in one cubic foot of propane and only about 1,000 BTU in one cubic foot of natural gas. Manufacturers tout the number of BTU their grills can produce, but the number can be very misleading. BTU is not indicative of the heat it can generate.
When physical symptoms considered to be somatic symptom disorder occur, it can be difficult to accept that a life-threatening illness has been eliminated as the cause. Symptoms cause very real distress for the person and reassurance isn't always helpful. Specific sensations, such as pain or shortness of breath, or more general symptoms, such as fatigue or weakness. 2  Unrelated to any medical cause that can be identified, or related to a medical condition such as cancer or heart disease, but more significant than what's usually expected.
Somatoform disorders are a severe form of somatisation where physical symptoms can cause great distress, often long-term. However, people with somatoform disorders are usually convinced that their symptoms have a physical cause.