Define 'hurt'?
If you keep googling symptoms and thinking the worst, then it's technically true that you are causing your self more mental pain.
Thinking is highly overrated unless applied to a specific and tangible problem.
Thinking about a disease you '
might' have is 100% pointless and serves no purpose.
Your thoughts are abstract, temporary and without any basis in reality. Anxiety and most forms of mental health problems are self fulfilling feedback loops generated by the sufferers insistence on repeating habitual worrying. Or so I've come to believe