Autistic patients have higher chances commorbid somatic symptoms. Therefore, it leads to more health-related concerns, such as autoimmune disease, gastrointestinal disease, cardiovascular disease, autonomic disorders. On average, autistic patient's life span is 16 years shorter than non-autistic patients. Furthermore, autistic patients are not able to convey or communicate their somatic symptoms in a clear and comprehensive manner. This leads to unable to receive proper health care in a timely manner.

Inclusion Criteria:

• ASD group: diagnosed with DSM-5 autism spectrum disorder
• clinical group: anxiety, depression, somatic disorder who are non-psychotic and non-organic
• control group: healthy control without psychiatric disorder or chronic somatic symptoms
• age between 15 and 70

Exclusion Criteria:

• psychiatric disorders such as schezophrenia, mood disorder.
• major physical disorder which can be potentially lethal
• who cannot read or comprehend the survey and questionnaire

as mentioned earlier, it is a retrospective study with existed data. Therefore, the 1423 participants are already collected in the past. We separate these existed data into three groups as mentioned in the eligibility criteria