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.
Recent literature has used the terms somatisation disorder, somatic symptom disorder, functional somatic syndromes and somatisation syndromes more or less interchangeably. Much of the evidence base relating to somatisation disorder is, however, also relevant to SSD and has been quoted where appropriate.ecent literature has used the terms somatisation disorder, somatic symptom disorder, functional somatic syndromes and somatisation syndromes more or less interchangeably. Much of the evidence base relating to somatisation disorder is, however, also relevant to SSD and has been quoted where appropriate.