Vagus nerve dysfunction (VND) is the reason for some long Covid symptoms, such as dysphonia, dysphagia, tachycardia and orthostatic hypotension.
An objective eye test can detect long COVID because it is linked to symptoms of pain, light sensitivity, irritation, and a vague pressure sensation in the eyes.
Hair and libido loss are the two new symptoms that have been added to the wider list of long COVID symptoms.