The draining lava left long, tube-like caverns. Of the four caves in this particular cluster, only Boyd Cave is now open to hikers. Arnold Ice Cave is filled with ice. Skeleton and Wind Cave were open to hikers until 2007, when they were gated closed to prevent vandalism and protect hibernating bats.
On the other hand, asthma is an ongoing chronic condition that has acute flare ups and chronic pulmonary insufficiency due to airway reactions that cause the bronchial tubes to be partially obstructed. This results in shortness of breath, chronic cough, frequent chronic bronchitis, chronic pneumonia and wheezing.
Asthma and allergies also involve the immune system. A normally harmless material, such as grass pollen, food particles, mold or pet dander, is mistaken for a severe threat and attacked. Other dysregulation of the immune system includes autoimmune diseases such as lupus and rheumatoid arthritis. Finally, some less common disease related to deficient immune system conditions are antibody deficiencies and cell mediated conditions that may show up congenitally, Lau told Live Science.