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For most of his adult life Darwin suffered from very poor health.<ref>http://www.answersingenesis.org/creation/v17/i4/darwins_illness.asp</ref> The 1992 ''New Encyclopaedia Britannica '' stated that Darwin's illness was [[psychogenic]] in origin (A psychogenic illness is one that originates in the mind or in mental condition). <ref>http://www.answersingenesis.org/creation/v17/i4/darwins_illness.asp</ref> According to medical journals Darwin suffered the following symptoms: palpitations, shortness of breathe ("air fatigues" ), light headedness ("head swimming" ), trembling, crying, dying sensations, abdominal distress, and depersonalization ("treading on air and vision"), nausea, severe vomiting, flatulence, alimentary canal pain, various forms of eruption of the skin, and nervous exhaustion. <ref>"The Illness of Charles Darwin", William B. Bean, September 1978, American Journal of Medicine and "''Charles Darwin and Panic Disorder''" by Thomas J. Barloon, MD and Russel Noyes, Jr., January 8, 1997 [[Journal of the American Medical Association]]</ref>

For most of his adult life Darwin suffered from very poor health.<ref>http://www.answersingenesis.org/creation/v17/i4/darwins_illness.asp</ref> The 1992 ''New Encyclopaedia Britannica '' stated that Darwin's illness was [[psychogenic]] in origin (A psychogenic illness is one that originates in the mind or in mental condition). <ref>http://www.answersingenesis.org/creation/v17/i4/darwins_illness.asp</ref> According to medical journals Darwin suffered the following symptoms: palpitations, shortness of breathe ("air fatigues" ), light headedness ("head swimming" ), trembling, crying, dying sensations, abdominal distress, and depersonalization ("treading on air and vision"), nausea, severe vomiting, flatulence, alimentary canal pain, various forms of eruption of the skin, and nervous exhaustion. <ref>"The Illness of Charles Darwin", William B. Bean, September 1978, American Journal of Medicine and "''Charles Darwin and Panic Disorder''" by Thomas J. Barloon, MD and Russel Noyes, Jr., January 8, 1997 [[Journal of the American Medical Association]]</ref>

According to the abstract for a 1997 journal article in the [[Notes and Records of the Royal Society]] the psychogenic hypothesis for the origin of Darwin's illness "holds the field" but the article questions the validity of this diagnosis due to the work of [[Ralph Colp Jr.]] MD, a physician and psychiatrist. <ref>http://www.journals.royalsoc.ac.uk/content/c5la8dhfh8v7tbx8/</ref><ref>http://www.pathlights.com/ce_encyclopedia/Encyclopedia/20hist06.htm</ref>

According to the abstract for a 1997 journal article in the [[Notes and Records of the Royal Society]] the psychogenic hypothesis for the origin of Darwin's illness "holds the field" but the article questions the validity of this diagnoses and mentions the work of [[Ralph Colp Jr.]] MD, a physician and psychiatrist. <ref>http://www.journals.royalsoc.ac.uk/content/c5la8dhfh8v7tbx8/</ref><ref>http://www.pathlights.com/ce_encyclopedia/Encyclopedia/20hist06.htm</ref>

Dr. Colp's work in relation to Darwin's illness is highly respected in the medical community and an article in the [[Journal of the American Medical Association]] stated regarding Colp's work the following: "His painstaking work in seeking out every possible source comes close to yielding the complete biography of an invalid's illness."<ref>''Charles Darwin and Panic Disorder''" by Thomas J. Barloon, MD and Russel Noyes, Jr., January 8, 1997 [[Journal of the American Medical Association]]</ref>  In a letter to the editor in the April 23/30 1997 edition of the [[Journal of the American Medical Association]] Dr. Colp wrote the following:  "I believe that Darwin's illness consisted of panic disorder (without agoraphobia), psychosomatic skin disorder, and possibly Chagras disease of the stomach." Dr. Colp also noted that Darwin had facial eczema that often was caused by controversies over his evolutionist ideas. In regards to the possible Chagas disease Dr. Colp states: "The disorder was first active and then became inactive, permanently injuring the parasympathetic nerves of his stomach and making it more sensitive to sympathetic stimulation and hence more sensitive to the "psychosomatic impact of his anxieties." An organic impairment best explains the lifelong chronicity of many of his abdominal complaints".

Dr. Colp's work in relation to Darwin's illness is highly respected in the medical community and an article in the [[Journal of the American Medical Association]] stated regarding Colp's work the following: "His painstaking work in seeking out every possible source comes close to yielding the complete biography of an invalid's illness."<ref>''Charles Darwin and Panic Disorder''" by Thomas J. Barloon, MD and Russel Noyes, Jr., January 8, 1997 [[Journal of the American Medical Association]]</ref>  In a letter to the editor in the April 23/30 1997 edition of the [[Journal of the American Medical Association]] Dr. Colp wrote the following:  "I believe that Darwin's illness consisted of panic disorder (without agoraphobia), psychosomatic skin disorder, and possibly Chagras disease of the stomach." Dr. Colp also noted that Darwin had facial eczema that often was caused by controversies over his evolutionist ideas. In regards to the possible Chagas disease Dr. Colp states: "The disorder was first active and then became inactive, permanently injuring the parasympathetic nerves of his stomach and making it more sensitive to sympathetic stimulation and hence more sensitive to the "psychosomatic impact of his anxieties." An organic impairment best explains the lifelong chronicity of many of his abdominal complaints".