Why are my gums bleeding from using a different toothbrush?

I've used the electric toothbrush for a few years & I've never had problems with bleeding gums.
I bought a regular toothbrush if I run out of battery while using the electric brush & don't have time to charge it.
The last two days when I've been using the regular brush, my gums have bled both days.
Should I be concerned?
Why are my gums bleeding from using a different toothbrush?
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