All iLive content is medically reviewed or fact checked to ensure as much factual accuracy as possible.
We have strict sourcing guidelines and only link to reputable media sites, academic research institutions and, whenever possible, medically peer reviewed studies. Note that the numbers in parentheses (, , etc.) are clickable links to these studies.
If you feel that any of our content is inaccurate, out-of-date, or otherwise questionable, please select it and press Ctrl + Enter.
Low basal temperature: in the second phase of the cycle, after ovulation, during pregnancy
Medical expert of the article
A low basal temperature can be one of the first signs of a pathology that can have a latent flow for a long time. It is very important to know which basal temperature is considered normal to understand when it comes to low values. Knowledge of changes in basal temperature in women will allow you to follow its cycle.
What is the basal body temperature?
Temperature is an indicator of the amount of heat contained in the system, and in the human body. Our temperature is a continuation of the body's basic metabolism and a host of other factors. Heat is a form of energy, and each reaction in the human body occurs at a certain level of energy or temperature, thus, well monitoring the voltage and pH of the cells.
For the normal functioning of the human body it is important to maintain this internal temperature, adjust the pH and optimize the stress of all cells. The main body temperature of the human body is an important factor, so you should always take it into account when assessing the health status under control. The normal core temperature is at the exact temperature at which all functions of the human body can work with optimum efficiency. The same can be said about pH, because all physiological processes are sensitive to pH. As a heartbeat and blood pressure, body temperature helps to assess a person's health. The temperature of the human body continues to change during various activities. The normal range of body temperature for oral measurement is 36.8 ± 0.7 degrees C. Normally the temperature is low in the morning, and when you start to exercise, it begins to grow. The body reaches its lowest temperature during sleep, which is called the body's basic temperature (or basal temperature). Despite sudden changes in air temperature, the body maintains its normal temperature range with the help of the brain, blood vessels, skin (sweat glands).
Usually, the rectal or vaginal temperature is considered as the core temperature. The ideal core temperature is about 37 ° Celsius. However, this temperature is the average body temperature and the total normal temperature ranges from 36.5 ° C to a maximum of almost 37.5 ° C. Any temperature above or below this range is abnormal. At an ideal temperature, all systems of the human body function with maximum efficiency, while oxygen is supplied in sufficient quantities, as CO2 levels are optimized.
Basal body temperature refers to the temperature at which the body must be in order to use the minimum energy necessary for survival. When the body reaches its basic body temperature during sleep, it is impossible to measure the actual basal temperature. The most accurate measurement of body temperature can be measured right after you wake up in the morning while your body is at rest. You can use a conventional thermometer or a basic thermometer to measure temperature early in the morning. Even leaving the bed while standing, can raise the body temperature, so you should measure it immediately after awakening. Also at night, the basal temperature may be lower than in the morning.
Basal thermometers show slight differences. A basal diagram of body temperature can help women know when ovulation has occurred. A woman can avoid pregnancy, or a woman can become pregnant soon, observing a record body temperature during the menstrual cycle.
Before ovulation in your body there is only a small amount of progesterone, and your body's basic temperatures (your resting temperatures) are in the lower range. After ovulation, when there is increased progesterone released from the yellow body, the temperature rises. The rise in temperature that occurs after ovulation is sufficient for measurement with a thermometer. After ovulation, your basal body temperature rises so much that you can see the difference between your ovulation temperatures and after ovulation, when they are plotted. The fertility schedule will show lower temperatures before ovulation, an increase (thermal shift), and then higher temperatures after ovulation. Ovulation usually occurs on the last day of lower temperatures.
Decrease in basal temperature can occur for various reasons.
Causes of lowering basal temperature
The causes of low basal temperature range from normal individual characteristics of a woman to serious pathology.
Low basal body temperature basically indicates slowing of enzymatic processes. The thyroid gland plays an important role in the metabolism of the body. Inadequate (slow work) of the thyroid gland can cause a low basal temperature. Iodine deficiency, the use of certain drugs, pituitary dysfunction, thyroid surgery, pregnancy, radiation therapy can lead to hypothyroidism. This condition needs proper medical attention.
Low basal body temperature can also be a potential symptom of the following diseases and disorders:
- Addison's disease;
- Drugs or alcohol abuse;
- Renal failure;
- Liver failure;
- Side effects of drugs;
- Bronchial asthma;
Since the basal temperature of women varies according to the menstrual cycle, there will be a phase of low temperature from the beginning of the menstrual cycle to ovulation. In the period after ovulation, a high-temperature phase occurs before menstruation. The basal temperature below 37 can be observed in the first phase of the cycle. Low basal temperature after ovulation may indicate a violation of the regulation of hormones, which often occurs in women with stress or fatigue.
It is necessary to measure the basal temperature to see the differences between the phases of low and high temperature - this is especially recommended if you have a low basal body temperature. If at the same time you see a difference of less than 0.3 ℃, or if you do not see an increase in basal body temperature, this may mean that your yellow body does not work properly. It should be clearly understood that the low basal temperature in the first phase of the cycle is the norm, but a low basal temperature in the second phase of the cycle indicates a violation of hormone secretion. Low basal temperature throughout the cycle may be the cause of the deficiency of the yellow body or the violation of the secretion of progesterone by the central mechanism. In such cases it is necessary to be surveyed with the definition of the level of these hormones.
Even if you have a low basal body temperature, there are no physical symptoms that are easy to detect. However, as blood circulation in the body worsens, sufficient nutrients and oxygen are not transported to the organs. This can make you feel lethargic and more susceptible to illness.
Poor blood circulation can also lead to swelling and low back pain or other chronic pain or illness. Perhaps you just dismissed these symptoms as a sign of a poor physical condition, but if you have a low basal body temperature, be aware that low basal body temperature and symptoms, such as back pain, can have a more direct relationship.
Can there be a low basal temperature during pregnancy? This may well be, because during pregnancy, the yellow body is in an active state and secretes hormones. But there may be an imbalance that explains such changes in basal temperature. It should be noted that a low basal temperature in the early stages of pregnancy can still be a normal value, but at a later date, this may indicate a lack of progesterone and circulatory disorders, respectively.
How does medication affect basal temperature? Any contraceptives disrupt ovulation, so the basal temperature may not rise. When a woman takes certain hormone replacement therapy, the level of changes in basal temperature can be a testament to the hormonal background and the effectiveness of treatment. For example, low basal temperature when taking Dufaston can talk about an insufficient dose of the drug. Since Dufaston is a preparation of the progesterone group, against the background of its administration, the level of progesterone should be sufficient for a peak increase in basal temperature.
Low basal temperature in menopause is sometimes a sign of the need for hormone replacement therapy for a woman, regardless of age. Since the climacterium should primarily decrease only estrogens, a reduced basal temperature suggests that progesterone is also lowered. And this aggravates all the symptoms and symptoms of menopause. Therefore, such changes in women in menopause may indicate a serious hormonal imbalance.
You may be concerned that your low basal body temperature affects your ability to have a baby. Do not worry - even if you have a low basal temperature, this does not mean that you will not get ovulation or you can not become pregnant. However, your uterus and other reproductive organs do not have enough blood flowing through them due to poor blood circulation, so this can affect ovulation. In addition, the endometrium may not become thick enough for a fertilized egg to implant an egg into it.
How to increase the low basal body temperature?
Exercises for women can be an excellent choice. When you exercise, you can expect your body temperature to increase. Blood is also pumped through your body more quickly, and you will also feel the heat emanating from the core of your body. No need for a tiring workout. Even if you do not have time for proper training, you can correct your body a little, making sure that you climb the stairs when you can. To improve your overall physical condition and push a low basal body temperature, you may have tried various methods in vain.
A low basal body temperature can be noticed suddenly, or it can be constant. Chronic low basal body temperature can lead to several complications with health, such as excessive fatigue, headache, dry skin and hair, irregularity or the absence of menstrual periods. Proper medications to treat the underlying condition and identify the cause of this can help return the temperature to a normal level.