Echinacea is commonly used to treat which of the following?

Echinacea is primarily recognized for its use in the treatment of the common cold and respiratory infections. This herbal remedy is believed to boost the immune system, helping the body fight off colds and other upper respiratory tract infections. Research suggests that it may reduce the length and severity of cold symptoms when taken at the onset of illness. The other options, such as diabetes, asthma, and hypertension, are not the primary indications for echinacea, as its efficacy for these conditions is not well-supported by scientific evidence. Hence, the association of echinacea with colds is well-founded and widely accepted in herbal medicine.