I have worked with both light and evil magic as a long-time practicing Witch.
You might never be aware if someone has cursed you.
Believe me. Others don’t find out until you tell them.
However, if someone crosses you, puts a hex on you, or curses you, it’s usually a result of evil witchcraft, VooDoo, or a related practice.
There are indicators, although they are typically small or almost unnoticeable.
You might notice your cream or milk curdling while it should still be good.
You might also notice a strange or slight smell of sulfur or a burnt smell.
You may be plagued with bad or frightening dreams or sleep paralysis.
You can become sick, weak, or unable to eat.
You may become lethargic or easily irritated.
The first thing you should do if you believe a spell has been cast is to sage your entire house.
In addition to that, consulting a priest, witch, or spiritualist may be necessary.