Explore the characteristics of TCM syndrome elements and distribution patterns of syndrome types in comorbid populations; Screen for "high-risk syndrome patterns" and frequently co-occurring complex syndromes; Identify characteristic syndrome patterns at key stages: acute phase, recovery phase, and upon occurrence of endpoint events; Investigate the temporal evolution of TCM syndrome patterns and the disease-syndrome correlation patterns in comorbid patients.

A registry study of 12,000 real-world patients with comorbidities is conducted to collect and investigate the epidemiological characteristics of populations with "Tang-Nao" (diabetes with cerebrovascular disease), "Tang-Xin" (diabetes with cardiovascular disease), and triple comorbidities. Through syndrome epidemiology surveys, multi-timepoint cross-sectional investigations on the TCM syndrome of "Toxin Damaging Collaterals" are performed to explore the characteristics of TCM syndrome elements and distribution patterns of syndrome types in comorbid populations, screen "high-risk syndromes" and frequently co-occurring complex syndromes, identify characteristic syndromes at acute phase, recovery phase, and upon occurrence of endpoint events, and investigate the evolution of TCM syndromes and disease-syndrome correlation patterns in comorbid patients.

Inclusion Criteria:

• Aged ≥ 18 years Diagnosed with comorbidities relevant to "toxin-damaged collaterals" theory (e.g., type 2 diabetes mellitus with cardiovascular/cerebrovascular disease).

Voluntary participation with signed informed consent.

Exclusion Criteria:

• Acute infectious diseases, malignant tumors, or autoimmune disorders. Mental illness or cognitive impairment affecting symptom assessment.

Adults with comorbid chronic diseases (e.g., diabetes, coronary heart disease) who meet TCM "toxin-damaged collaterals" syndrome criteria.