What can cause slightly elevated white blood cell count?

Slightly elevated white blood cell counts can be caused by a variety of factors, including mild infections, inflammation, stress, or allergic reactions. Other possible causes include recent physical activity, certain medications, or underlying medical conditions such as autoimmune disorders. In some cases, even minor factors like dehydration or smoking can contribute to a temporary increase in white blood cell levels. It's important to interpret these results in the context of a person's overall health and symptoms.