Final answer:
Mastitis can occur in both unilateral and bilateral forms, but it is more common in the unilateral form.
Step-by-step explanation:
Mastitis can occur in both unilateral and bilateral forms, but it tends to be more common in the unilateral form.
Unilateral mastitis refers to inflammation and infection in only one breast, while bilateral mastitis refers to inflammation and infection in both breasts.
Although bilateral mastitis is possible, it is relatively rare compared to unilateral mastitis.