When the earth is in bloom and the colors of spring begin to show, it looks like quite the happy place to be outdoors. However, there’s nothing like allergies to ruin a beautiful day, and recent studies have found that it may not just be the pollen that’s affecting your mood.

According to neuropsychologist Dr. Paul Marshall, of the Hennepin County Medical Center in Minneapolis, Minnesota, those who are suffering from allergies have approximately two times the risk of developing depression. Also, individuals whose allergies are so severe that they need to be seen by a specialist have three times the likelihood of being depressed, reports CNN.

What’s important to remember is the age-old scientific mantra: correlation does not imply causation. Marshall is quick to note that mood can be affected simply by experiencing allergies, but allergies do not cause depression.

“Experiencing allergic reactions does seem to be a risk factor for developing depression – not necessarily the emotional side of the condition, but more physiological symptoms, such as low energy,” said the new outlet.

A study led by Dr. Teodor Postolache published in 2008 supports Marshall’s claims, as Postolache’s research found that suicide rates were at their highest between April and June, when pollen count also peaks. Cytokines, a substance released during an allergic reaction, reportedly trigger fatigue, which potentially leads to a negatively affected mood. Also, antihistamines used to combat allergies may cause sleep disturbances, which lead to a low mood.

The main idea is that those who are susceptible to depression may feel worse during allergy season. If you experience both conditions simultaneously, opt for an allergy treatment that causes less drowsiness, or speak to your doctor about an alternative medication.