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.
As in other somatoform disorders, medical examinations and testing generally find no clear physical cause for the symptoms. Pain disorder and body dysmorphic disorder Two other kinds of somatoform disorders are pain disorder and body dysmorphic (dis-MOR-fik) disorder. Pain disorder is similar to somatization disorder, except that pain is the main symptom. The pain may be in one or several areas of the body, but it doesn't fit a pattern of any particular medical illness or injury, and diagnostic tests fail to show the presence of any disease.