Modifiers matching irregularity:

• small,
• visual,
• geometrical,
• extreme,
• local,
• genetic,
• financial,
• geological,
• optical,
• cardiac,
• tiny,
• geometric,
• minor,
• physiological,
• menstrual,
• microscopic,
• structural,
• cellular,
• biological,
• epidermal,
• superficial,
• large,
• dental,

Simple categories matching menstrual:

• irregularity,
• distress,
• disturbance,
• symptom,
• product,
• condition,
• supply,
• syndrome,
• cycle,
• problem,
• disorder,