Inclusion Criteria:

- meet the clinical diagnosis of Long COVID by the World Health Organization (WHO),
with no neuropsychiatric symptoms 1 year before infection with Covid-19, and
continue to have at least one neuropsychiatric symptom for 2 months after SARS-CoV-2
turned negative 3 months above;

- aged 12 to 80 years;

- willing and able to consent, and complete all assessment and study procedures

Exclusion Criteria:

- patients with a history of chronic neuropsychiatric symptoms;

- cardiovascular diseases pre-existing to the Covid-19 episode such as arrhythmia,
heart failure, myocardial infarction, and patients with cardiac pacemakers;

- documented pre-existing history of psychiatric illness, including substance abuse;

- suicidal tendencies (attempted suicide in the 12 months before the study);

- any chronic or remote neurological disorder (i.e. stroke, head trauma, epilepsy,
tumor);

- those who participated in other clinical trials within one month;

- pregnant or lactating female patients;

- have surgery within two months before the study or will have a scheduled surgery
during the study;

- acute brain injury or acute encephalopathy from another etiology than Covid-19
(e.g., sepsis, liver or renal failure, alcohol or drug withdrawal, drug toxicity);

- open-heart cardiac surgery or cardiac arrest during the last 6 months;

- patients who received acupuncture treatment 1 month before the start of the study;

- patients who were unable to complete the assessment during screening due to severe
mental, cognitive, or emotional impairment