Hormones play a big role in how humans behave. They can lead to feelings and actions that are tough to understand.

• Changes: Hormones can change a lot, especially during times of stress (like when we have too much $Cortisol$) or during certain life stages (like when $Estrogen$ and $Testosterone$ levels change). These changes can cause behavior that is unpredictable and different from day to day.

• Difficulties: Because everyone's hormones are different, it’s hard to figure out a one-size-fits-all explanation for behavior. For instance, the same hormone might make one person feel angry while making another feel caring. This makes it tricky to come up with clear answers.

• Ways to Help: Researchers can try to make things clearer by doing long-term studies. They can control for outside factors that might affect behavior and use advanced methods to look closely at hormones. By finding more clear connections, they hope to better understand how hormones relate to behavior, but this is still a tough challenge.