Pulsation/throb (like heartbeat) for about 10 seconds on left side of head near ear-No pain. Only one time. What is this? Could it be a brain tumour?

No! Symptoms like this and sharp pains etc happen often but they are to be ignored as they are too transient to make much out of them. Any serious problems will produce persistent symptoms which will keep getting worse with time. That is when you need to get concerned and seek medical attention. Ninety nine percent of such symptoms have no implications and are to be ignored to begin with.

Related Questions

Headache in front/back left side of head, ear. Tiny jabs of pain (1-2). Light headed when standing. Scared I have a brain tumor. No fam history. Help!

Seek evaluation. There could be many reasons for the symptoms you are describing. If they are persisting you need to be evaluated sooner rather than waiting. Recognizing that you are worried about a possible brain tumor, please know that there could be many simpler explanations, but the only way to be reassured about that is to see your doctor. They will decide about appropriate tests. Read more...
Unlikely. Brain tumors are uncommon in people your age, and a light-headed feeling isn't typically a symptom of one. If you have serious headaches you should see your doctor, and ask for a referral to a neurologist both to evaluate your problem and to treat the headaches. Read more...

Postdromal migraine or brain tumor? Mild pain on left side of head, ringing ears, ear fullness and dizziness for 4 days after week long migraine.

How about neither? There seems to be an inexplicable epidemic of brain tumor anxiety among otherwise young healthy people. Like that furshlugginer ice bucket challenge that had the unintended consequence of an epidemic of ALS anxiety among otherwise healthy young people. - This may have been a viral infection that spread to your middle & inner ear. If it persists more than a few more days, see your doctor. Read more...