Long Covid is a condition where people experience persistent symptoms or new symptoms that develop after experiencing an acute COVID-19 infection. These symptoms can include fatigue, shortness of breath, brain fog, joint pain, and more, and can last for months or years after the initial infection.

ME/CFS is a complex and debilitating condition characterized by profound fatigue that is not alleviated by rest, as well as a range of other symptoms such as cognitive impairment, pain, and sleep disturbances.

Postural Orthostatic Tachycardia Syndrome (POTS) is a condition in which there is an abnormal increase in heart rate upon standing, leading to symptoms such as dizziness, lightheadedness, and fainting. POTS is caused by dysfunction of the autonomic nervous system, which controls many of the body's automatic functions such as heart rate and blood pressure. POTS can be triggered by a variety of factors such as dehydration, prolonged standing, or heat exposure.

Dysautonomia refers to a group of conditions in which there is dysfunction of the autonomic nervous system, which controls many of the body's automatic functions such as heart rate, blood pressure, and digestion. This can lead to a range of symptoms such as dizziness, fainting, rapid heartbeat, and gastrointestinal issues.

Mast Cell Activation Syndrome (MCAS) is a condition in which mast cells, which play a role in the immune system, are activated inappropriately and release excessive amounts of chemicals such as histamine, leading to a range of symptoms such as skin rashes, itching, abdominal pain, and fatigue. MCAS can be triggered by a variety of factors such as stress, medications, or environmental allergens.

Post-Exertional Malaise (PEM) is a hallmark symptom of ME/CFS in which physical or mental exertion can lead to a worsening of symptoms that can last for days or even weeks. PEM can be triggered by activities that would not normally be considered strenuous, and can lead to a range of symptoms such as fatigue, cognitive impairment, and pain.