Myrtle (Myrtus communis) has a long history of use in traditional medicine systems, particularly in Mediterranean and Middle Eastern cultures. In these traditions, myrtle leaves and berries have been prepared as teas, tinctures, or poultices to address a variety of ailments, including respiratory conditions, skin issues, and general inflammation. The use of myrtle for "swollen glands"—a term often referring to enlarged lymph nodes—originates from these traditional practices, where it was believed that myrtle’s astringent and anti-inflammatory properties could help reduce swelling and support the lymphatic system.

However, there is a lack of robust scientific research specifically validating myrtle’s effectiveness for treating swollen lymph nodes or directly supporting lymphatic gland function. Some laboratory studies have identified anti-inflammatory and antimicrobial compounds in myrtle, such as myrtucommulone and various essential oils, which may provide a rationale for its traditional use in managing infections or inflammation. Nevertheless, these findings are preliminary and do not directly substantiate its clinical benefit for swollen lymph nodes in humans.

In summary, the belief in myrtle’s value for swollen glands is rooted in traditional herbal medicine, not in modern clinical evidence. There are no well-designed human studies confirming its efficacy for this particular indication.