This @Let’s Discover Wine video tells the two possible ways you can get headaches from drinking red wine that contains tannin. Tannin is one of the five main characteristics of a wine: Tannin, Acidity, Sweetness, Alcohol, and Body.
There will be an additional link here to the full video to discuss these 5 aspects of a wine. It should be up by Dec 12.
This short video has a companion short on the taste of tannin, which is the cause of headaches in red wine.
In the meantime, you might be interested in viewing:
Why is California’s a wine so sweet?
How do they make California wine so sweet, even though they are not allowed to add actual sugar?
Are you afraid of buying French wine? This video clears up confusion in French classification and terms.
Even though 3 Italian wines have the word Montepulciano in the wine’s title, only one of the three can be called “Montepulciano” wine.
Do you know the difference between vintage and Non-Vintage wine?