Why Is My Period Late? Irregular Menstrual Cycles

Menstruation has suddenly stopped?

My menstrual cycle is about 35 or 36 days long.
My last period started on June 15, but now it's already mid-August and my period has not arrived.
On June 24, I engaged in some intimate touching with my boyfriend, but he did not insert his genitals into my vagina; he only stimulated me at the entrance (at that time, he had already ejaculated but did not clean himself and did not use protection).
I would like to ask the doctor, what could be the issue?

Bao'er, 10~19 year old female. Ask Date: 2016/08/17

Dr. Lin Manying reply Obstetrics and Gynecology

If you have had sexual intercourse, please take a pregnancy test first.
If you are not pregnant, you may visit a medical facility for an examination or to induce menstruation.

Reply Date: 2016/08/17

More Info

There are several reasons why your menstrual period may be late, especially considering your typical cycle length of 35 to 36 days. Irregular menstrual cycles can be influenced by a variety of factors, including hormonal imbalances, stress, lifestyle changes, and even medical conditions. Let's explore these factors in more detail.

1. Pregnancy: The most common reason for a missed period is pregnancy. Even if you did not have penetrative intercourse, the possibility of sperm coming into contact with the vaginal opening (especially if there was ejaculation nearby) can lead to pregnancy. Sperm can swim and may still reach the cervix, resulting in fertilization. If you suspect pregnancy, taking a home pregnancy test is advisable. These tests are most accurate when taken after a missed period.

2. Hormonal Imbalances: Hormones play a crucial role in regulating your menstrual cycle. Conditions such as polycystic ovary syndrome (PCOS), thyroid disorders, or other hormonal imbalances can disrupt your cycle and lead to missed periods. If you have a history of irregular cycles or other symptoms (like weight gain, acne, or excessive hair growth), it may be worth discussing these possibilities with your healthcare provider.

3. Stress and Lifestyle Factors: High levels of stress can significantly affect your menstrual cycle. Stress can lead to hormonal fluctuations that may delay ovulation or menstruation. Additionally, lifestyle factors such as significant weight loss or gain, excessive exercise, or changes in diet can also impact your cycle. If you have experienced any major life changes or stressors recently, this could be a contributing factor.

4. Medical Conditions: Certain medical conditions can affect your menstrual cycle. Conditions such as endometriosis, uterine fibroids, or pelvic inflammatory disease can lead to irregularities in your cycle. If you have other symptoms, such as pelvic pain, heavy bleeding, or unusual discharge, it is essential to seek medical advice.

5. Age and Menopause: If you are in your late 30s or early 40s, it is also possible that you are experiencing perimenopause, a transitional phase leading up to menopause. This phase can cause irregular periods and other symptoms as hormone levels fluctuate.

6. Medications: Certain medications, including hormonal contraceptives, can affect your menstrual cycle. If you have recently started or stopped any medications, this could be a factor in your missed period.

Given your situation, it is essential to take a home pregnancy test if you suspect pregnancy. If the test is negative and your period does not arrive soon, or if you have other concerning symptoms, it would be wise to consult with a healthcare provider. They can perform a thorough evaluation, including a physical exam and possibly blood tests, to determine the underlying cause of your irregular cycle.

In summary, while a late period can be concerning, it is essential to consider all potential factors, including pregnancy, hormonal imbalances, stress, lifestyle changes, and medical conditions. Monitoring your cycle and any accompanying symptoms will provide valuable information for your healthcare provider to help you understand and address the issue effectively.

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