1 Tracheoesophageal fistula: An abnormal channel forms to connect the trachea and the esophagus. 2  Passage of swallowed food from the esophagus into the trachea causes serious lung problems. 3  Tracheal foreign body: An object is inhaled (aspirated) and lodges in the trachea or one of its branches.
The cycle of hair growth in eyebrows is completely different and shorter compared to the cycle of hair growth in head. Usually for head hair, it will take around 5-6 months to regrow but in case of eyebrows it is only a matter of 2-3 months.
This is the eyebrow growth phase and how long it lasts varies per person - by gender, age as well as genetics. It's basically the length of this time that determines how long the hair will grow. As you might've guessed, this phase is much shorter for brows than it is for the hair on our heads, which is why eyebrows don't grow past a certain point.