No they're not just crazy, hormonal, or defiant.
It's a cry for help

Links to resources for those parenting a child, have a friend or loved one, or themselves may be suffering from a mental health problem.

Quotes Borrowed from youthdynamics.org

“Challenging behavior occurs when the demands and expectations being placed upon a child outstrip the skills they have to respond"

“Beneath every behavior there is a feeling, and beneath each feeling there is a need. When we meet that need rather than focusing on the behavior, we begin to deal with the cause not the symptom.”

Autism

Autism Speaks - https://www.autismspeaks.org/

Child Mind Institute - https://childmind.org/guide/parents-guide-to-autism/

Anxiety

Anxiety & Depression Association of America - https://adaa.org/

Child Mind Institute - https://childmind.org/topics/anxiety/#anxiety-and-kids-the-basics

Oppositional Defiance Disorder

Very Well Mind - https://www.verywellmind.com/before-you-look-for-information-on-odd-3106614

Child Mind Institute - https://childmind.org/guide/quick-guide-to-oppositional-defiant-disorder/

Depression

Help Guide.ORG - https://www.helpguide.org/articles/depression/parents-guide-to-teen-depression.htm

Healthy Children.ORG - https://www.healthychildren.org/English/health-issues/conditions/emotional-problems/Pages/Childhood-Depression-What-Parents-Can-Do-To-Help.aspx

ADHD/ADD - yes its real, trust me I know

CHADD - https://chadd.org/

ADDitutde Magazine - https://www.additudemag.com/

This is just a very short list of resources I've used. There are many, many more. If you know of any that you've found a major help in yours, or your child life let me know and I'll add it to the list's.