diff --git a/DESCRIPTION b/DESCRIPTION
index 675d565..926209c 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: ggVennDiagram
 Type: Package
 Title: A 'ggplot2' Implement of Venn Diagram
-Version: 1.5.1
+Version: 1.5.2
 Authors@R: c(
   person("Chun-Hui","Gao", email="gaospecial@gmail.com", role=c("aut","cre"), comment=c(ORCID = "0000-0002-1445-7939")),
   person("Guangchuang", "Yu", email = "guangchuangyu@gmail.com", role = c("ctb"), comment = c(ORCID = "0000-0002-6485-8781")),
@@ -41,6 +41,7 @@ Suggests:
     plotly,
     RColorBrewer,
     shiny,
-    rmarkdown
+    rmarkdown,
+    tidyr
 VignetteBuilder: knitr
 LazyData: true
diff --git a/NEWS.md b/NEWS.md
index 29789dc..e70e690 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,9 @@
 # Changelog of ggVennDiagram
 
+## ggVennDiagram 1.5.2
+
+* Add a switch to show non-specific items in `plot_upset`. See #64.
+
 ## ggVennDiagram 1.5.1
 
 * Add more param to `plot_upset()` function
diff --git a/R/process_data.R b/R/process_data.R
index b792e2d..00103df 100644
--- a/R/process_data.R
+++ b/R/process_data.R
@@ -104,7 +104,7 @@ venn_region = function(obj){
 #' @export
 #'
 plotData_add_venn = function(plotData, venn){
-  if (!all(c("setLabel","setEdge","regionLabel", "regionEdge") %in% names(plotData))){
+  if (!all(c("setLabel","setEdge","regionLabel", "regionEdge") %in% names(plotData))) {
     stop("Invalid shape data.")
   }
   if (!inherits(venn, "Venn")) stop("venn should be a S4 Venn object.")
@@ -142,7 +142,7 @@ plotData_add_venn = function(plotData, venn){
 #' process_set_data(venn)
 #' process_region_data(venn)
 process_set_data = function(venn){
-  if(!inherits(venn, "Venn")) stop("venn is not a S4 class 'Venn' object.")
+  if (!inherits(venn, "Venn")) stop("venn is not a S4 class 'Venn' object.")
   tibble::tibble(
     id = as.character(seq_along(venn@sets)),
     name = venn@names,
@@ -152,10 +152,18 @@ process_set_data = function(venn){
 }
 
 #' @rdname venn_data
+#' @param specific whether return ONLY specific items for a subset, default is TRUE
+#' @details
+#'  ggVennDiagram, by default, only return the specific subsets of a region.
+#'  However, sometimes, we want to show all the overlapping items for two or more sets.
+#'  For example: https://github.com/gaospecial/ggVennDiagram/issues/64
+#'  Therefore, we add a 'specific' switch to this function. While 'specific = FALSE',
+#'  the seperator will be changed from "/" to "~", and all the overlapping items
+#'  will be returned. This feature is useful in plotting upset plot.
 #' @export
-process_region_data = function(venn, sep = "/"){
-  if(!inherits(venn, "Venn")) stop("venn is not a S4 class 'Venn' object.")
-  region_items = get_subset_items(venn)
+process_region_data = function(venn, sep = "/", specific = TRUE) {
+  if (!inherits(venn, "Venn")) stop("venn is not a S4 class 'Venn' object.")
+  region_items = get_subset_items(venn, specific = specific)
   counts = sapply(region_items, length)
   region_ids = get_subset_ids(venn, sep = sep)
   region_names = get_subset_names(venn, sep = sep)
diff --git a/R/regions.R b/R/regions.R
index 2352917..e172e74 100644
--- a/R/regions.R
+++ b/R/regions.R
@@ -17,10 +17,11 @@ matrix2list <- function(matrix){
   lapply(seq_len(ncol(matrix)), function(i) matrix[,i])
 }
 
-get_subset_items <- function(venn){
+get_subset_items <- function(venn, specific = TRUE){
   n = length(venn@sets)
   c = combinations(n)
-  lapply(c, function(i) discern_overlap(venn,i))
+  fun = ifelse(specific, "discern_overlap", "overlap")
+  lapply(c, fun, venn = venn)
 }
 
 get_subset_names <- function(venn, sep = "/"){
diff --git a/R/upset_plot.R b/R/upset_plot.R
index 214aa71..2df84e0 100644
--- a/R/upset_plot.R
+++ b/R/upset_plot.R
@@ -34,6 +34,7 @@
 #' @param sets.bar.show.numbers default is FALSE
 #' @param sets.bar.x.label default is "Set Size"
 #' @param intersection.matrix.color default is "grey30"
+#' @param specific whether only include specific items in subsets, default is TRUE.
 #' @param ... useless
 #' @return an upset plot
 #'
@@ -62,6 +63,7 @@ plot_upset = function(venn,
                       sets.bar.show.numbers = FALSE,
                       sets.bar.x.label = "Set Size",
                       intersection.matrix.color = "grey30",
+                      specific = TRUE,
                       ...){
   # process arguments
   order.intersect.by = match.arg(order.intersect.by)
@@ -71,7 +73,8 @@ plot_upset = function(venn,
   data = process_upset_data(venn,
                            nintersects = nintersects,
                            order.intersect.by = order.intersect.by,
-                           order.set.by = order.set.by)
+                           order.set.by = order.set.by,
+                           specific = specific)
   p_main = upsetplot_main(data$main_data,
                           intersection.matrix.color = intersection.matrix.color)
 
@@ -183,21 +186,31 @@ theme_upset_left = function(){
 #' process upset data
 #'
 #' @inheritParams upset-plot
-#' @param name_separator will be used to assign subset names
+#' @param specific whether return ONLY specific items for a subset, default is TRUE
+#' @details
+#'  ggVennDiagram, by default, only return the specific subsets of a region.
+#'  However, sometimes, we want to show all the overlapping items for two or more sets.
+#'  For example: https://github.com/gaospecial/ggVennDiagram/issues/64
+#'  Therefore, we add a 'specific' switch to this function. While 'specific = FALSE',
+#'  the seperator will be changed from "/" to "~", and all the overlapping items
+#'  will be returned. This feature is useful in plotting upset plot.
 #'
 #' @return a upsetPlotData object
 process_upset_data = function(venn,
                               nintersects = 30,
                               order.intersect.by = "size",
                               order.set.by = "name",
-                              name_separator = "/"){
-  data = process_region_data(venn, sep = name_separator)
-  data$size = data$count
+                              specific = TRUE){
   set_name = venn@names
+  name_separator = ifelse(specific, "/", "~")
+
+  # region data
+  data = process_region_data(venn, sep = name_separator, specific = specific)
+  data$size = data$count
 
   # top data
   top_data = data |> dplyr::select(c('id', 'name', 'item', 'size'))
-  if (order.intersect.by %in% colnames(top_data)){
+  if (order.intersect.by %in% colnames(top_data)) {
     top_data = dplyr::mutate(top_data,
                              id = forcats::fct_reorder(.data$id, .data[[order.intersect.by]], .desc = TRUE))
   } else {
@@ -208,7 +221,7 @@ process_upset_data = function(venn,
   left_data = dplyr::tibble(set = set_name,
                             name = set_name,
                             size = lengths(venn@sets))
-  if (order.set.by %in% colnames(left_data)){
+  if (order.set.by %in% colnames(left_data)) {
     left_data = dplyr::mutate(left_data,
                               set = forcats::fct_reorder(.data$set, .data[[order.set.by]], .desc = TRUE))
   } else {
@@ -224,7 +237,7 @@ process_upset_data = function(venn,
   main_data$id = factor(main_data$id, levels = levels(top_data$id))
 
   # filter intersections
-  if (is.numeric(nintersects)){
+  if (is.numeric(nintersects)) {
     keep_id = utils::head(levels(top_data$id), nintersects)
     main_data = main_data |> dplyr::filter(.data$id %in% keep_id)
     top_data = top_data |> dplyr::filter(.data$id %in% keep_id)
diff --git a/man/process_upset_data.Rd b/man/process_upset_data.Rd
index b3b7c2f..06abb10 100644
--- a/man/process_upset_data.Rd
+++ b/man/process_upset_data.Rd
@@ -9,7 +9,7 @@ process_upset_data(
   nintersects = 30,
   order.intersect.by = "size",
   order.set.by = "name",
-  name_separator = "/"
+  specific = TRUE
 )
 }
 \arguments{
@@ -21,7 +21,7 @@ process_upset_data(
 
 \item{order.set.by}{'size', 'name', or "none"}
 
-\item{name_separator}{will be used to assign subset names}
+\item{specific}{whether return ONLY specific items for a subset, default is TRUE}
 }
 \value{
 a upsetPlotData object
@@ -29,3 +29,11 @@ a upsetPlotData object
 \description{
 process upset data
 }
+\details{
+ggVennDiagram, by default, only return the specific subsets of a region.
+ However, sometimes, we want to show all the overlapping items for two or more sets.
+ For example: https://github.com/gaospecial/ggVennDiagram/issues/64
+ Therefore, we add a 'specific' switch to this function. While 'specific = FALSE',
+ the seperator will be changed from "/" to "~", and all the overlapping items
+ will be returned. This feature is useful in plotting upset plot.
+}
diff --git a/man/upset-plot.Rd b/man/upset-plot.Rd
index a05a2c4..03308a5 100644
--- a/man/upset-plot.Rd
+++ b/man/upset-plot.Rd
@@ -20,6 +20,7 @@ plot_upset(
   sets.bar.show.numbers = FALSE,
   sets.bar.x.label = "Set Size",
   intersection.matrix.color = "grey30",
+  specific = TRUE,
   ...
 )
 }
@@ -52,6 +53,8 @@ plot_upset(
 
 \item{intersection.matrix.color}{default is "grey30"}
 
+\item{specific}{whether only include specific items in subsets, default is TRUE.}
+
 \item{...}{useless}
 }
 \value{
diff --git a/man/venn_data.Rd b/man/venn_data.Rd
index 4752649..bde5d2f 100644
--- a/man/venn_data.Rd
+++ b/man/venn_data.Rd
@@ -8,12 +8,14 @@
 \usage{
 process_set_data(venn)
 
-process_region_data(venn, sep = "/")
+process_region_data(venn, sep = "/", specific = TRUE)
 }
 \arguments{
 \item{venn}{a Venn object}
 
 \item{sep}{name and id separator for intersections}
+
+\item{specific}{whether return ONLY specific items for a subset, default is TRUE}
 }
 \value{
 a tibble
@@ -21,6 +23,14 @@ a tibble
 \description{
 Prepare Venn data
 }
+\details{
+ggVennDiagram, by default, only return the specific subsets of a region.
+ However, sometimes, we want to show all the overlapping items for two or more sets.
+ For example: https://github.com/gaospecial/ggVennDiagram/issues/64
+ Therefore, we add a 'specific' switch to this function. While 'specific = FALSE',
+ the seperator will be changed from "/" to "~", and all the overlapping items
+ will be returned. This feature is useful in plotting upset plot.
+}
 \examples{
 x = list(
 A = sample(letters, 8),