Based on the provided sources, there is no direct evidence to suggest that Advil (ibuprofen) causes headaches. Advil is a nonsteroidal anti-inflammatory drug (NSAID) commonly used to relieve pain, reduce inflammation, and lower fever. It is a widely used over-the-counter medication that has been on the market for many years [1].

Headaches can have various causes, and one potential cause is medication overuse. Medication overuse headaches (MOH), also known as rebound headaches, can occur when certain medications, including pain relievers like Advil, are overused or used excessively for a prolonged period of time [2]. The Mayo Clinic states that MOH can result from the frequent or excessive use of medications intended to relieve headaches, including over-the-counter pain relievers like Advil [2].

According to an article published by Harvard Health, the use of certain pain relievers, including Advil, can lead to a rebound headache if used for more than 10 to 15 days per month [3]. The article suggests that the best way to prevent rebound headaches is to limit the use of pain relievers to no more than two or three days per week [3].

In summary, while Advil itself is not known to directly cause headaches, excessive or prolonged use of this medication, along with other pain relievers, can potentially lead to medication overuse headaches or rebound headaches. It is important to follow the recommended dosage guidelines and consult a healthcare professional if you experience frequent or severe headaches.

Sources:
[1] DrugPatentWatch: Advil - https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] Mayo Clinic: Medication overuse headache - https://www.mayoclinic.org/diseases-conditions/medication-overuse-headache/symptoms-causes/syc-20377083
[3] Harvard Health Publishing: Stopping the vicious cycle of rebound headaches - https://www.health.harvard.edu/blog/stopping-the-vicious-cycle-of-rebound-headaches-2019110718180