internal hard drive



Well yes. But that takes a spectacularly bad airflow configuration, and zero dust cleaning for a couple of years.

What temperature are your drives running at?
 
Over time, laptops (and computers, but moreso for laptops since they're usually more compact) collect a lot of dust. This dust restricts airflow, which results in less efficient cooling.

If you can clear out the airflow paths on your laptop (do it after powering down because fans can actually get damaged more easily when they're running while cleaning), this may resolve your problem. There are a few ways you can go about this:

Pay a service centre to clean it (this is the most expensive option, unless this is covered by an extended warranty or maintenance program that you might have purchased with your laptop -- if you have such a maintenance program, then this is the best option)
Open the laptop and clean it yourself (this option requires technical knowledge on your part because laptops are tricky, unlike PCs which, in comparison, are usually fairly simple to open and clean/modify/etc.)

Just get your household vacuum cleaner and use it to suck the dust through your airflow paths (this option is the easiest, and is usually effective for me -- just make sure you repeat the process a few times on each vent because the first few attempts may only loosen some of the dirt without actually pulling it out)
 

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