1. What is the developmental order of adolescent boys?

In adolescence, the development order of boys is as follows:

Testis and penis began to increase at10-1year;

1 1- 12 years old, the prostate began to secrete and the throat became enlarged;

12- 13 years old, with enlarged testicles, rapid penis growth and pubic hair growth;

13- 14 years old, with thick voice and induration under nipple;

14- 15 years old with axillary hair, voice change and first nocturnal emission;

15- 16 years old scrotum darkened;

16- 17 years old has a long beard and the pubic hair is prismatic;

The growth trend of 17- 18 years old is slow, and it transits to mature type.

2. What about nocturnal emission?

Nocturnal emission is a physiological phenomenon. Men generally start nocturnal emission around 15 years old. According to the survey, almost every healthy man will encounter this situation. The causes of nocturnal emission are:

First, when the sperm is full, it will overflow: after the male enters puberty, the testis will continue to produce sperm, and the seminal vesicle and prostate will continue to produce secretions. With the continuous production of sperm and secretions, when the body stores a certain amount, it will be discharged.

Second, local stimulation: underwear is too tight, bedding is pressed and rubbed, phimosis, foreskin is too long, urethritis, prostatitis and other diseases can cause local stimulation, leading to nocturnal emission.

Third, sexual stimulation: too close contact with women, watching descriptive novels or movies, so that the mind is too focused on sexual issues, leading to nocturnal emission during sleep. The habit of masturbation can also easily lead to nocturnal emission.

Some young people, because of the lack of sexual knowledge, take spermatorrhea seriously, thinking that it will "greatly hurt their vitality", affect their development, and produce fear and anxiety. In fact, this is completely unnecessary.

3. Is nocturnal emission harmful to the body?

The nocturnal emission is that men ejaculate without sexual intercourse, and the manifestations of nocturnal emission are wet dream and nocturnal emission. The essence of dreams is nocturnal emission accompanied by dreams during sleep, and nocturnal emission is nocturnal emission during waking. Is nocturnal emission harmful to the body? To answer this question, we need to do some concrete analysis. Unmarried young men's spermatorrhea, the frequency of young men's spermatorrhea from once a month to twice a week is a normal physiological phenomenon, and the semen is full and overflowing. Young people who have had the above frequency of nocturnal emission, please don't be afraid, because this is a normal sexual physiological reaction and harmless to the body. What needs to be clear is that because there is no universal knowledge of physical health in China, although nocturnal emission itself is harmless to the body, the psychological load caused by nocturnal emission cannot be underestimated. Some young people accept some wrong sexual physiological concepts, regard semen as more important than blood, and think that nocturnal emission is the loss of "essence" of the body and hurts the "vitality" of the body. Every time they have nocturnal emission, they are anxious and even frightened. Some people also suffer from mental weakness, which affects their study, work and physical and mental health. Therefore, it is very necessary to correctly understand and treat nocturnal emission.

However, if spermatorrhea is too frequent, such as several times a night, or semen will flow out as soon as there is sexual impulse or even asexual impulse, this is not normal. Abnormal nocturnal emission can be summarized into two reasons. First, there are pathological changes in the urogenital system, such as balanitis, urethritis and prostatitis. Timely treatment of these diseases can make nocturnal emission return to normal. Second, the concept of eroticism is too heavy, often fantasizing, which makes the sexual center too tired and reduces the control ability of subordinate ejaculation institutions. Therefore, once there is sexual impulse, semen will flow out. For this kind of patients, qigong therapy can be used, and at the same time, we must make up our minds to abandon too many pornographic concepts. People's sexual desire is dominated by people's consciousness and ideas. It is not difficult to treat frequent nocturnal emission as long as we constantly strengthen our self-cultivation, cultivate moral sentiments, get rid of vulgar tastes, stop watching pornographic books and movies, and concentrate on our study and work.

4. What problems should boys pay attention to during the voice change period?

Teenagers entering adolescence are in the period of voice change in youth. At this time, it is especially necessary to pay attention to protecting the vocal cords, otherwise it may affect life. As we know, the main function of the throat is pronunciation. When pronouncing, the muscles that close the glottis in the larynx narrow the glottis, and then the airflow exhaled by the lungs passes through the glottis and vibrates the vocal cords. The human larynx is a highly sensitive organ, and the vocal cords are like the reeds of an organ. If the vocal cords are thin and narrow, the sound is treble, otherwise it is bass. Pronunciation is related to strength, the tension of homophone band and the intensity of exhaled air flow. If the vocal cords are relaxed, the expiratory intensity is small and the tone is low; On the contrary, the vocal cords are tense, the breathing intensity is high, and the tone is high. The width and thickness of adult male vocal cords are much larger than those of children and women, so it is difficult for men to make high notes. If there is something wrong with the vocal cords, the voice will become hoarse. Ligaments change greatly during adolescence. At this time, the Adam's apple grows rapidly, and the vocal cords thicken rapidly, with mild congestion. The original children's voice gradually disappeared and a deep voice appeared. This is called the voice change period. The voice change period mostly refers to boys, with obvious changes. Although there are some changes in girls, they are not significant. During the voice change period, the first thing is to protect your voice, and don't overuse it, otherwise it will increase the burden of vocal cords and make them more congested and edema; Do not eat or should not eat spicy and greasy food; Smoking and drinking should be banned; Once your voice becomes hoarse, rest immediately and talk less, let alone speak loudly. At ordinary times, we should insist on physical exercise, improve physical resistance and do a good job in the prevention and treatment of upper respiratory tract infections.

5. What are the main points of male external genital health care?

External genitalia hygiene is a "blind spot" for boys and teenagers, and many people don't know why male external genitalia also needs cleaning. This can be analyzed from the following three aspects:

First, male external genitalia includes penis and scrotum. The penis is divided into penis head, also called glans penis and penis. The joint between the penis head and penis is called coronal sulcus, and there is an upturned foreskin in the coronal sulcus. Exfoliated epithelial cells, gland secretions in the foreskin, dust and residues after urine evaporation accumulate in the foreskin to form scales, which have a stimulating effect on the penis head and are easy to cause inflammation. If the foreskin still completely covers the penis head during the puberty, it is called "phimosis". If it can be turned up, but the penis head can't be exposed often, it is called "too long foreskin". People with too long foreskin and phimosis have more scales and are more harmful because the foreskin tightly wraps the penis head. Studies have shown that echinococcosis has carcinogenic effect and can cause penile cancer. At the same time, unclean external genitalia after marriage can induce the occurrence of reproductive diseases of spouses.

Second, scrotum is an important tissue to protect testis. Its skin surface is rich in sweat glands and often secretes sweat. If it is not cleaned for a long time, it will cause scrotal infection and inflammation under the action of sweat and bacteria on the skin surface. Long-term sweat stimulation is also an important cause of scrotal eczema.

Third, the anus will discharge feces every day, and there will always be a small amount of feces left in the anus. There are many bacteria in feces, and the warm and humid perineum has become a good breeding ground for bacteria.

For the above reasons, young men should also clean their perineum frequently. When cleaning, you should pay attention to cleaning the penis and scrotum in front, especially removing the dirt in the foreskin, and then cleaning the anus in the back to keep these parts clean. Teenagers with long foreskin and phimosis should ask a doctor to check them and see if they need surgery.

6. How to prevent "acne"?

Acne is a chronic inflammation of hair follicles and sebaceous glands, which mostly occurs on the face, chest and back. It can form blackheads, rashes, pustules, nodules and cysts. Acne mostly occurs in adolescent men and women, and most of them naturally recover or relieve after puberty. The initial damage of acne is mostly blackhead acne. In addition to blackheads, papules and pustules, there are also inflammatory nodules or cysts from broad beans to nails in a few serious cases. Cysts can fester, form abscesses, and often form sinuses and scars after rupture. Acne patients are mostly unconscious, and if the inflammation is obvious, it can cause pain or tenderness. To prevent acne, we should first pay attention to adjusting the function of digestive tract, changing eating habits, eating less fat and sweets, and eating more vegetables and fruits. Always wash your face, take a bath and change clothes frequently. Young women should use less cosmetics on their faces. Cosmetics that may cause skin allergy should be banned to reduce the external conditions of the disease. Once you have acne, be sure to wash the affected area with warm soapy water, don't squeeze it, and don't use bromine or iodine drugs. At the same time, we should insist on taking vitamin B, vitamin b6, vitamin b2, vitamin B complex and calcium pantothenate. Severe patients can consult a doctor. Appropriate use of endocrine drugs, such as diethylstilbestrol powder, chorionic gonadotropin and progesterone. Infected patients can use appropriate antibiotics. Topical drugs can also be used appropriately according to the doctor's guidance. You can also add 10 ml vinegar to wash or apply your face. Avoid using grease cosmetics.