The condition tends to run in families, although no gene has been discovered yet.

The condition tends to be inherited and may not show up until later in life.

For unknown reasons, the condition tends to be much more common and severe in men than women.

Generally, many different states and starting conditions will tend toward the same stable equilibrium.

This condition tends to affect women in their 30s and 40s.

The condition tends to run in families, so genes may be involved.

The course is mostly flat but conditions in May tend to be very hot.

For some time, it has been known that allergic conditions tend to cluster in families.

The condition tends to affect women more frequently than men.

The condition may last for years but tends to disappear gradually by age 30.