Is it normal for my parents to always argue?

If it is everyday, then no. But if it is arguing every once in a while, I think that is a good sign.

They've parents. They care. It's a normal thing not even for the parents. People who care tend to argue a lot. Of course it is not a reason to let yourself engage in a bad or harmful argument with someone.

It is normal for everyone to argue. People have different opinions with each other. But when two people always argue, it's because they have different opinions and are not very tolerant about other's opinion. It is a good step to talk to them if you think they don't respect each other opinion, sometimes some people don't realize this.

It's natural to argue. Unfortunately it's not when repeated frequently. Parents aren't perfect, children might have a good image of them that changes over the course of the years. And sadly, the kids might also be subject to being included in their personal arguments which is completely unfair. There should be good communication between the parent and child to understand that personal issues should not interfere with a child's growing up process. Attaining that can prove difficult, so parents should be aware that arguing openly can alter a kid's lifestyle.

Parents, as normal couples, may have argues; But when those become frequent and harmful isn't no normal or healthy

Arguing in relationships is normal. Your parents aren't going to agree on everything. They can argue about what to eat or who gets the remote. However, excessive arguing can mean there's an issue bothering one or both people.