How can premenstrual syndrome affect women?

The premenstrual period can affect women both physically and psychologically.

Explanation:

The main cause of PMS is hormonal change during the menstrual period, which interferes with the central nervous system. There seems to be a connection between female sex hormones, endorphins (natural substances linked to the sensation of pleasure) and neurotransmitters such as serotonin. The result is that women begin to have both psychological and physical changes, such as:

the second one is wrong

explanation:

when comparing the cases, what similarities are there in the cases that suggest one person committed these murders?